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Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Tetrahedral Freibergite crystal with Pyrite. 3.5mm field of view. Image created using CombineZ software.
© Michael D. Cline
Ground Hog Mine, Battle Mountain, Gilman Mining District, Eagle County, Colorado, USA
A very thick Gold wire. Perhaps the finest of its kind. Specimen is from the Burrage collection #583 at Harvard University #100378. The scale at the bottom of image is an inch with a rule at one cm. It has been suggested that this specimen may be from Ground Hog Mine, Battle Mountain, Gilman District (Battle Mountain District; Red Cliff District), ...
© Rock Currier
Wyoming Mine, Gilman Mining District, Eagle County, Colorado, USA
1.5 x 1.4 x 1.3 cm. Highly lustrous and complete all the way around save for one small area, this is an excellent example of an “Iron Cross Twin”, a habit of Pyrite is hard to find. Ex. Marilyn Dodge Collection.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Iridescent chalcopyrite crystals with minor siderite. Additional photos show provenance; Ex. E. Mitchell Gunnell Collection, ex. Merle Reid (Crystal Gallery), ex. Benjy Kuehling Collection and Columbine Mineral Shop. Circa 1960's.
© Daniel Evanich 2022
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
5.0 x 5.0 x 2.6 cm. The Eagle Mine is probably best known for its sulfide specimens. This cluster is a great piece of Eagle Mine chalcopyrite showing classic sharp, lustrous faces. The largest crystal measures 2.0 cm across, which are coated by sphalerite. A nice representative miniature piece of this well known material from this now defunct ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Two very sharp and lustrous intergrown pyritohedrons that also have excellent and attractive striations. A fine Pyrite for the locale! 2.7 x 2 x 1.5 cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Thin plate of sharp digenite crystals. Excellent luster and crystal definition.
© 2002 John H. Betts
Gilman Mining District, Eagle County, Colorado, USA
Single complex crystal (partial) of pyrite coated with lustrous steel-gray Tetrahedrite (?). One such lustrous specimen had Cu and Sb in the coating. Many such specimens, usually from Rio Rico, were coated with galena or tetrahedrite. There was never any nickel in these coatings, so none of it was ever bravoite. Ex. J. Cilen #2498. Overall size ...
© 2001 John H. Betts
Rocky Point area, 1700' level, Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Gemmy golden barite crystals to 12 mm on brown siderite crystal matrix. Mined in 1959. Originally acquired from R. Kosnar in 1995. Ex. Dr. E. Sensel collection #M1030. Overall size of mineral specimen: 6x5x3 cm. Size of individual crystals: 4-12 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of golden barite crystals to 13 mm from the classic Colorado locality for barite. Each barite crystal has an outer transparent zone and sandy-looking center zone. Originally acquired in 1962 from Scott Williams. Ex. Dr. E. Sensel collection #B193. Overall size of mineral specimen: 16x8x5 cm. Size of individual crystals: 4-13 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Lustrous cluster of black marmatite crystals mixed with flattened, light gray siderite crystals. Clean and undamaged. Overall size of mineral specimen: 42x35x22 mm. Size of individual crystals: 1-8 mm.
© 2003 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Pale Ankerite on sphalerite. Speciman is 3.8cm across. Photographed by, and in the collection of, Karl Volkman
© Karl Volkman
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of transparent golden barite crystals from the classic Colorado locality for barite. Originally acquired in 1965. See article: Minerals of the Eagle Mine and Gilman District in Rocks and Minerals July-Aug. 1980. Ex. A. Stevenson collection #324. Overall size of mineral specimen: 30x23x12 mm. Size of individual crystals: 4-10 mm.
© 2001 John H. Betts
Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
Hyalite on calcite in vesicular basalt. Alan Goldstein specimen (#1312) and photo. Collected August 5, 1987. Fluoresces bright green in SW UV light.
© Alan Goldstein
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of transparent golden barite crystals from the classic Colorado locality for barite. Originally acquired in 1965. See article: Minerals of the Eagle Mine and Gilman District in Rocks and Minerals July-Aug. 1980. Ex. A. Stevenson collection #389. Overall size of mineral specimen: 20x15x15 mm. Size of individual crystals: 4-7 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Marmatite with ankerite and pyrite, speciman is 4.4cm across. Photographed by, and in the collection of, Karl Volkman.
© Karl Volkman
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A beautiful and pristine toenail specimen of lustrous, light pink rhodochrosite blades on two connected mounds of sphalerite from the famous Eagle Mine at Gilman, Colorado. Choice material from this locale. 3.1 x 2.3 x 1.4 cm
© Rob Lavinsky & irocks.com
Gilman Mining District, Eagle County, Colorado, USA
Many yellow-brown siderite crystals almost completely covering sulfide matrix. The siderite crystals are thin, disc-shaped crystals in rosettes. Classic specimen. No damage. Overall size of mineral specimen: 9x7x4 cm. Size of individual crystals: 5-12 mm.
© 2002 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A classic old Eagle Mine combo: sharp, brassy chalcopyrite crystals on a matrix of shiny, euhedral sphalerites. This specimen has a really nice balance between the two minerals, and a large chalcopyrite with wonderful form sits up perfectly on the sphalerite. A superb representative mini for this combo! 5.1 x 3.9 x 2.9cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This is a 3x3 inch piece of the iron rich variety of sphalerite called marmatite from the Eagle Mine. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 3.2 by 2.8 cms specimen of small crystals with minor Pyrite. JSS specimen and photograph.
© 2006 JSS
Gilman Mining District, Eagle County, Colorado, USA
Plate of yellow-metallic chalcopyrite crystals with a small spray of white quartz crystals on one edge. The yellow color is quite intense making this specimen quite showy. No damage. Overall size of mineral specimen: 7x6x2 cm. Size of individual crystals: 2-8 mm.
© 2002 John H. Betts
Gilman Mining District, Eagle County, Colorado, USA
Elongated cluster of lustrous pyrite crystals up to 9 mm. No matrix attached, minor styrofoam on bottom (may be soaked off). Originally acquired ca. 1958. No damage. Ex. Earle Sullivan collection (Ct.). Overall size of mineral specimen: 6x3x3 cm. Size of individual crystals: 2-9 mm.
© 2002 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A superb old Eagle Mine specimen, combining platy pink rhodochrosite crystals with bright pyrites, on a plate of sphalerite. One of two fine old Eagle Mine pieces in this auction! This one has a wonderful balance of the three minerals. 5.0 x 4.6 x 1.2cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12 mm wide FOV. Crystals of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 2x3 inch group of bladed siderite from the Eagle Mine. In the Creekmur collection.
© Charles Creekmur
Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
Hyalite on calcite in vesicular basalt. Alan Goldstein specimen (#1314) and photo. Collected August 5, 1987. Fluoresces bright green in SW UV light.
© Alan Goldstein
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A SUPERB old Colorado golden barite specimen! The crystals are like golden GEMS, measuring to about 0.7 cm. These crystals cover both sides of the matrix. One side has creamy little barite microcrystals between the larger gemmy crystals, but the prettier side is just has the crystals sitting right up on the matrix. This superb piece came out of ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 2.3 by 2.2 cms group of lustrous crystals. JSS specimen and photograph.
© 2006 JSS
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
2.0 x 1.6 x 1.3 cm. A 1.1 cm, sharp, attractive, well-formed group of grey Freibergite crystals sitting on sparkling, lustrous, cubic Pyrite matrix. The Freibergite group shows excellent tetrahedral form as you can see from the micro photos. Ex. Marilyn Dodge and Brian Kosnar Collections.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Lustrous crystals of translucent, green-brown barite lining one face of matrix. Overall size of mineral specimen: 4x3.5x3 cm. Size of individual crystals: 2-7 mm.
© 2003 John H. Betts
Fulford Mining District, Eagle County, Colorado, USA
Fluorapatite from Fulford, Eagle County, ColoradoCrystal of good size, a floater, having well defined prism and terminal faces. This is a rare locality, there are usually very few in collections.Size:5.2 x 4.3 x 3.9 cm
© Fabre Minerals https://www.fabreminerals.com
Gilman Mining District, Eagle County, Colorado, USA
It is just not that easy to find an old Colorado pyrite with the top quality of a good Peruvian specimen, but this one qualifies. Super-bright golden crystals to 1.4 cm, with pretty striations, on BOTH SIDES of the specimen. Much brighter in person! This is a killer....It came to me from a respected Denver dealership, as well, so i am confident of ...
© Rob Lavinsky & irocks.com
Dotsero Crater Occurrence, Dotsero, Eagle County, Colorado, USA
These are the "Dotsero Diamonds" actually quartz that has crystallized in the vacoules of the scoria and basalt. Specimen collected by Rudy Bolona.
Crystal Lode pegmatite, Fulford Mining District, Eagle County, Colorado, USA
Crystal; 5x3x1.5cm; A good specimen from this locality where most crystals are very fractured and incomplete. Collection of Rudy Bolona.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This 1 1/2 x 2 1/2 inch bladed cluster of siderite crystals comes from the Eagle Mine in Gilman. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 3x2 inch specimen of the iron rich variety of sphalerite called marmatite covered with small pyrite cubes with a crust of siderite covering some of the piece. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This is a big 9x4x2 inch slab of pyrite from the Eagle Mine. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
top-most crystal is 9mm wide. Photographed by Karl Volkman. In the collection of Donald Volkman
© karl Volkman 2004
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
5.5 x 4.8 x 1.6 cm. These are arguably the finest golden Barite crystals from Colorado. The best of these specimens show a very rich golden color and excellent gem quality crystals. This piece is comprised of dozens of gemmy, sharp, lustrous, rich golden color Barites sitting on a bed of tan colored Siderite "discs". This mine is long defunct and ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
RRUFF Project Specimen ID: R050272 Locality: Eagle mine, Gillman, Colorado, USA Source: University of Arizona Mineral Museum 13548 Gray-white rhombohedral crystals
© Rruff Project
Crystal Lode pegmatite, Fulford Mining District, Eagle County, Colorado, USA
A nice example of Apatite from Colorado. This crystal has a gemmy termination. The pegmatite that these come from is very hard work and few complete crystals are found, and even fewer with gemmy terminations. specimen size = 2.1 x 1.7 x 1.6 cm.
© Russell G. Rizzo & Cal Neva Mineral Co.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
50 x 30 mm specimen of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Gilman Mining District, Eagle County, Colorado, USA
A beautiful, showy and pristine specimen of super-brilliant brassy and striated pyritohedrons with sphalerite crystal clusters scattered on the pyrite faces from the famous and now-closed Gilman District of Colorado. 5.3 x 3.4 x 2.6 cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.6 x 3.7 x 3.1 cm. Many sharp, attractive, very well-formed, classic, tetrahedral Freibergite crystals up to 2.5 mm are associated with well-formed golden crystals of Chalcopyrite and soft pink-beige "rosettes" of Siderite with minor Quartz. This specimen was a gift from the well-known Colorado collector Hall Miller to Richard Kosnar in late ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
6.1 x 3.9 x 3.2 cm. An OLD-TIME, showy and extremely rich silver ore combination specimen from the famous Eagle Mine of Colorado. Barbed, spinel-twinned silver crystals to 4.8 cm! saturate the matrix, which is solid pastel-pink rhodochrosite! The silvers have a variable patina, which adds to the attractiveness. Hefty for its size at 110 grams. A ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Rhodochrosite, pyrite, and sphalerite, with minor quartz, turned. Purchased at Tucson Electric Park 2014. Collection of Dennis Tryon. **
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Apatite crystals on pyrite. Specimen from the collection of Bengie Kuhling 1974. Scale at bottom of image is an inch with a rule at one cm.
© Rock Currier
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.2 x 3.5 x 2.2 cm, 57.7 g This specimen consists of black sphalerite crystals with cream-coloured siderite crystals. Note: This specimen is already in the mindat database: http://www.mindat.org/photo-11397.html
© 2009 Eric C. Graff
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Brilliant lustrous brassy crystals of pyrite to 1 cm in size are completely and thickly coating the top of this 8.7 x 8.7 x 2.7 cm massive pyrite matrix. There is very minor chipping present; overall this is in good shape damage-wise. A Colorado classic! Ex Don Belsher Collection.
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
An extremely lustrous, sparkling and colorful specimen of the jet-black, Iron-rich variety of Sphalerite called Marmatite, accented by tan crystals of Ankerite up to 7 mm. in size. Also present on the upper left side of the specimen are many lustrous micro crystals of Pyrite and on the lower left portion are several crude crystals of Galena. The ...
© Russ Rizzo & Cal Neva Mineral Company
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Opaque black iron-rich sphalerite (variety 'marmatite') with minor tan tabular-lenticular siderite crystals and pyrite.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A large 10.0 x 7.2 x 6.3 cm matrix, this covered by sparkling black sphalerite crystals to 0.55 cm in size. Scattered throughout are brown ankerite crystals to 0.7 cm. Overall in good condition. Nice cabinet piece for this famous locality.
© Dan & Diana Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 4.2 by 3.2 cms specimen of small, rounded and light brown crystals on Pyrite and Shalerite crystals. JSS specimen and photograph.
© 2006 JSS
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 9.8 x 6.4 x 6.3 cm matrix of crystallized bright brassy pyrite, this hosting crystals of galena to 2.0 cm and sphalerite to 1.8 cm. In good condition overall. Nice locality piece.
© Dan & Diana Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
9.8 x 5.4 x 3.5 cm. An old-time specimen of some note for the locality because of the richness and quality of the pyrrhotite crystallization. This is nicely perched on contrasting pink rhodochrosite. From an old collection. Joe Budd photos.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 7.9 x 5.7 x 3.5 cm matrix, the top completely covered by tan colored platy flattened rhombohedral crystals of siderite to 6 mm in size. Very clean of damage; upon close inspection the crystals are slightly translucent. A good example from this noted Colorado locality! Ex Don Belsher collection; a data card comes with the piece dating his ...
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
10.3 x 7.8 x 3.8 cm Largest Tetrahedrite: 5 mm A rarely seen specimen of the highly sought after Silver-bearing Tetrahedrite on charmingly contrasting white rhombs of Dolomite measuring up to 1.8 cm from the Eagle Mine (more properly the New Jersey Zinc Eagle Mine) near the ghost town of Gilman. Most of the Tetrahedrite from this locality ...
© Brian Kosnar - Mineral Classics
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Subject: 28 mm x 28 mm. Photograph by Peter Cristofono.
© 2006 Peter Cristofono
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.1 x 4.0 x 2.8 cm. The Eagle mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a good representative Eagle mine Pyrite showing typical striated pyritohedra with sharp, lustrous faces. Ex. Jaime Bird Collection.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Golden baryte crystals on a siderite matrix from the Eagle Mine, Gilman, Colorado. The largest baryte (upper right) is 1 cm across and the whole specimen is 7.5 cm across. The reverse side is composed entirely of small, brown, discs of siderite. Collection of J. Nemitz.
© J. Nemitz
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Black sphalerite (var. marmatite) to 6 mm exhibiting striated faces, hopper growth features, and iridescence; with dull gray galena crystals to 8 mm with orange and white overgrowths of an unknown mineral, also a few disk-shaped siderite crystals. This specimen is a small piece of a much larger specimen that deteriorated and crumbled into many ...
© Lawrence Violett
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.4 x 3.3 x 2.6 cm. These classic Rhodochrosite specimens from the Eagle mine are some of the most recognizable and attractive Rhodochrosites from Colorado. They are not the typical blocky rhombic habit like those seen from the Sweet Home, but rather highly compressed rhombs that usually form beautiful "rosettes". This piece hosts dozens of sharp, ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Cluster of striated and etched crystals of polybasite. Specimen 3.2 cm left to right. Collection and photograph Norman King.
© Norman King
State Bridge area, Eagle County, Colorado, USA
4.2 x 3.2 x 2.3 cm. Recently, a local digger in Colorado found some very interesting Pyrite specimens in the State Bridge area in Colorado. Typically, the specimens from this area are found in shale, but these new specimens are essentially crystallized spherical "floater" aggregates of Pyrite, which have formed over/around Ammonite fossils. It is ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12.2 x 7.8 x 3.7 cm. The Eagle mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a superb piece of Eagle mine Pyrite showing classic striated pyritohedra with sharp, lustrous faces. The largest crystal measures 1.4 cm across, and the piece is in fantastic shape overall. A great full sized cabinet piece of this well ...
© Rob Lavinsky & irocks.com
Gilman, Gilman Mining District, Eagle County, Colorado, USA
From an American classic locality. Although originally labeled as Bravoite in reference to the grayish coating on Pyrite crystals, our analysis didn't confirm the existence of Bravoite. Subsequent consultations also confirm that it is not Bravoite and, even knowing that similar specimens could also contain Molybdenite, this species didn't appear ...
© Fabre Minerals https://www.fabreminerals.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12.7 x 10.0 x 3.1 cm. The Eagle Mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a fine specimen of Eagle Mine Pyrite showing classic striated pyritohedra with sharp, highly lustrous faces. The largest crystal measures 2.7 cm across, and the piece is in excellent condition overall, and has superb luster for the ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This specimen consists of a complex cluster of brilliant golden Pyrite crystals that host a lustrous 'disc' of pink Rhodochrosite. There are some thin, platy crystals of Pyrrhotite in association and some massive Sphalerite on the reverse as well. Collected in 1975. Specimen size is 2.06cm x 1.73cm x .98cm.
© Jasun McAvoy & mineralman.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A flattish 9.6 x 7.2 x 2.7 cm matrix, the top almost completely covered by brownish tan opaque lenticular crystals of siderite to 11 mm in size. Minor black sphalerite in association. Overall very clean of damage. Nice hand sample for this noted locality. Ex Don Belsher collection.
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Pyrite. Specimen is from the Roebling collection at the Smithsonian Institute, Museum of Natural History #R15115 (1973). Scale at bottom of image is an inch with a rule at one cm.
© Rock Currier
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
30 mm wide FOV, specimen of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Wolcott, Eagle County, Colorado, USA
A example of common opal from the road cut in Tertiary basalt north of Wolcott, showing the specimen in ambient light on the left, and exhibiting bright green fluorescence in short-wave ultraviolet light on the right. Currently in the Polhemus collection, catalog # POL-MIN-2018-0569. Dan A. Polhemus photo, 2019.
© Dan A. Polhemus, 2019
Fulford Mining District, Eagle County, Colorado, USA
Fluorapatite has been known to have come from this area in Colorado. Good ones seem to seldom make it out of the state. The miniature shown here is of excellent quality. This is a single terminated crystal measuring 3.8 x 2 x 2.1 cm in size, very glassy in luster and showing a lot of translucency. The back right side is not quite complete, ...
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.6 x 3.7 x 3.1 cm. Many sharp, attractive, very well-formed, classic, tetrahedral Freibergite crystals up to 2.5 mm are associated with well-formed golden crystals of Chalcopyrite and soft pink-beige "rosettes" of Siderite with minor Quartz. This specimen was a gift from the well-known Colorado collector Hall Miller to Richard Kosnar in late ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Tetrahedral Freibergite crystal with Pyrite. 3.5mm field of view. Image created using CombineZ software.
© Michael D. Cline
Ground Hog Mine, Battle Mountain, Gilman Mining District, Eagle County, Colorado, USA
A very thick Gold wire. Perhaps the finest of its kind. Specimen is from the Burrage collection #583 at Harvard University #100378. The scale at the bottom of image is an inch with a rule at one cm. It has been suggested that this specimen may be from Ground Hog Mine, Battle Mountain, Gilman District (Battle Mountain District; Red Cliff District), ...
© Rock Currier
Wyoming Mine, Gilman Mining District, Eagle County, Colorado, USA
1.5 x 1.4 x 1.3 cm. Highly lustrous and complete all the way around save for one small area, this is an excellent example of an “Iron Cross Twin”, a habit of Pyrite is hard to find. Ex. Marilyn Dodge Collection.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
5.0 x 5.0 x 2.6 cm. The Eagle Mine is probably best known for its sulfide specimens. This cluster is a great piece of Eagle Mine chalcopyrite showing classic sharp, lustrous faces. The largest crystal measures 2.0 cm across, which are coated by sphalerite. A nice representative miniature piece of this well known material from this now defunct ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Iridescent chalcopyrite crystals with minor siderite. Additional photos show provenance; Ex. E. Mitchell Gunnell Collection, ex. Merle Reid (Crystal Gallery), ex. Benjy Kuehling Collection and Columbine Mineral Shop. Circa 1960's.
© Daniel Evanich 2022
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Two very sharp and lustrous intergrown pyritohedrons that also have excellent and attractive striations. A fine Pyrite for the locale! 2.7 x 2 x 1.5 cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Thin plate of sharp digenite crystals. Excellent luster and crystal definition.
© 2002 John H. Betts
Gilman Mining District, Eagle County, Colorado, USA
Single complex crystal (partial) of pyrite coated with lustrous steel-gray Tetrahedrite (?). One such lustrous specimen had Cu and Sb in the coating. Many such specimens, usually from Rio Rico, were coated with galena or tetrahedrite. There was never any nickel in these coatings, so none of it was ever bravoite. Ex. J. Cilen #2498. Overall size ...
© 2001 John H. Betts
Rocky Point area, 1700' level, Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Gemmy golden barite crystals to 12 mm on brown siderite crystal matrix. Mined in 1959. Originally acquired from R. Kosnar in 1995. Ex. Dr. E. Sensel collection #M1030. Overall size of mineral specimen: 6x5x3 cm. Size of individual crystals: 4-12 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Pale Ankerite on sphalerite. Speciman is 3.8cm across. Photographed by, and in the collection of, Karl Volkman
© Karl Volkman
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of golden barite crystals to 13 mm from the classic Colorado locality for barite. Each barite crystal has an outer transparent zone and sandy-looking center zone. Originally acquired in 1962 from Scott Williams. Ex. Dr. E. Sensel collection #B193. Overall size of mineral specimen: 16x8x5 cm. Size of individual crystals: 4-13 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Lustrous cluster of black marmatite crystals mixed with flattened, light gray siderite crystals. Clean and undamaged. Overall size of mineral specimen: 42x35x22 mm. Size of individual crystals: 1-8 mm.
© 2003 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of transparent golden barite crystals from the classic Colorado locality for barite. Originally acquired in 1965. See article: Minerals of the Eagle Mine and Gilman District in Rocks and Minerals July-Aug. 1980. Ex. A. Stevenson collection #389. Overall size of mineral specimen: 20x15x15 mm. Size of individual crystals: 4-7 mm.
© 2001 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Plate of transparent golden barite crystals from the classic Colorado locality for barite. Originally acquired in 1965. See article: Minerals of the Eagle Mine and Gilman District in Rocks and Minerals July-Aug. 1980. Ex. A. Stevenson collection #324. Overall size of mineral specimen: 30x23x12 mm. Size of individual crystals: 4-10 mm.
© 2001 John H. Betts
Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
Hyalite on calcite in vesicular basalt. Alan Goldstein specimen (#1312) and photo. Collected August 5, 1987. Fluoresces bright green in SW UV light.
© Alan Goldstein
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A beautiful and pristine toenail specimen of lustrous, light pink rhodochrosite blades on two connected mounds of sphalerite from the famous Eagle Mine at Gilman, Colorado. Choice material from this locale. 3.1 x 2.3 x 1.4 cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Marmatite with ankerite and pyrite, speciman is 4.4cm across. Photographed by, and in the collection of, Karl Volkman.
© Karl Volkman
Gilman Mining District, Eagle County, Colorado, USA
Many yellow-brown siderite crystals almost completely covering sulfide matrix. The siderite crystals are thin, disc-shaped crystals in rosettes. Classic specimen. No damage. Overall size of mineral specimen: 9x7x4 cm. Size of individual crystals: 5-12 mm.
© 2002 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A classic old Eagle Mine combo: sharp, brassy chalcopyrite crystals on a matrix of shiny, euhedral sphalerites. This specimen has a really nice balance between the two minerals, and a large chalcopyrite with wonderful form sits up perfectly on the sphalerite. A superb representative mini for this combo! 5.1 x 3.9 x 2.9cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This is a 3x3 inch piece of the iron rich variety of sphalerite called marmatite from the Eagle Mine. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 3.2 by 2.8 cms specimen of small crystals with minor Pyrite. JSS specimen and photograph.
© 2006 JSS
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A superb old Eagle Mine specimen, combining platy pink rhodochrosite crystals with bright pyrites, on a plate of sphalerite. One of two fine old Eagle Mine pieces in this auction! This one has a wonderful balance of the three minerals. 5.0 x 4.6 x 1.2cm
© Rob Lavinsky & irocks.com
Gilman Mining District, Eagle County, Colorado, USA
Plate of yellow-metallic chalcopyrite crystals with a small spray of white quartz crystals on one edge. The yellow color is quite intense making this specimen quite showy. No damage. Overall size of mineral specimen: 7x6x2 cm. Size of individual crystals: 2-8 mm.
© 2002 John H. Betts
Gilman Mining District, Eagle County, Colorado, USA
Elongated cluster of lustrous pyrite crystals up to 9 mm. No matrix attached, minor styrofoam on bottom (may be soaked off). Originally acquired ca. 1958. No damage. Ex. Earle Sullivan collection (Ct.). Overall size of mineral specimen: 6x3x3 cm. Size of individual crystals: 2-9 mm.
© 2002 John H. Betts
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12 mm wide FOV. Crystals of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 2x3 inch group of bladed siderite from the Eagle Mine. In the Creekmur collection.
© Charles Creekmur
Road side quarry on Hwy 131, Wolcott, Eagle County, Colorado, USA
Hyalite on calcite in vesicular basalt. Alan Goldstein specimen (#1314) and photo. Collected August 5, 1987. Fluoresces bright green in SW UV light.
© Alan Goldstein
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A SUPERB old Colorado golden barite specimen! The crystals are like golden GEMS, measuring to about 0.7 cm. These crystals cover both sides of the matrix. One side has creamy little barite microcrystals between the larger gemmy crystals, but the prettier side is just has the crystals sitting right up on the matrix. This superb piece came out of ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 2.3 by 2.2 cms group of lustrous crystals. JSS specimen and photograph.
© 2006 JSS
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
2.0 x 1.6 x 1.3 cm. A 1.1 cm, sharp, attractive, well-formed group of grey Freibergite crystals sitting on sparkling, lustrous, cubic Pyrite matrix. The Freibergite group shows excellent tetrahedral form as you can see from the micro photos. Ex. Marilyn Dodge and Brian Kosnar Collections.
© Rob Lavinsky & irocks.com
Gilman Mining District, Eagle County, Colorado, USA
It is just not that easy to find an old Colorado pyrite with the top quality of a good Peruvian specimen, but this one qualifies. Super-bright golden crystals to 1.4 cm, with pretty striations, on BOTH SIDES of the specimen. Much brighter in person! This is a killer....It came to me from a respected Denver dealership, as well, so i am confident of ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Lustrous crystals of translucent, green-brown barite lining one face of matrix. Overall size of mineral specimen: 4x3.5x3 cm. Size of individual crystals: 2-7 mm.
© 2003 John H. Betts
Fulford Mining District, Eagle County, Colorado, USA
Fluorapatite from Fulford, Eagle County, ColoradoCrystal of good size, a floater, having well defined prism and terminal faces. This is a rare locality, there are usually very few in collections.Size:5.2 x 4.3 x 3.9 cm
© Fabre Minerals https://www.fabreminerals.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This 1 1/2 x 2 1/2 inch bladed cluster of siderite crystals comes from the Eagle Mine in Gilman. In the Charles Creekmur collection.
© Charles Creekmur
Dotsero Crater Occurrence, Dotsero, Eagle County, Colorado, USA
These are the "Dotsero Diamonds" actually quartz that has crystallized in the vacoules of the scoria and basalt. Specimen collected by Rudy Bolona.
Crystal Lode pegmatite, Fulford Mining District, Eagle County, Colorado, USA
Crystal; 5x3x1.5cm; A good specimen from this locality where most crystals are very fractured and incomplete. Collection of Rudy Bolona.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
top-most crystal is 9mm wide. Photographed by Karl Volkman. In the collection of Donald Volkman
© karl Volkman 2004
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 3x2 inch specimen of the iron rich variety of sphalerite called marmatite covered with small pyrite cubes with a crust of siderite covering some of the piece. In the Charles Creekmur collection.
© Charles Creekmur
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This is a big 9x4x2 inch slab of pyrite from the Eagle Mine. In the Charles Creekmur collection.
© Charles Creekmur
Crystal Lode pegmatite, Fulford Mining District, Eagle County, Colorado, USA
A nice example of Apatite from Colorado. This crystal has a gemmy termination. The pegmatite that these come from is very hard work and few complete crystals are found, and even fewer with gemmy terminations. specimen size = 2.1 x 1.7 x 1.6 cm.
© Russell G. Rizzo & Cal Neva Mineral Co.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
5.5 x 4.8 x 1.6 cm. These are arguably the finest golden Barite crystals from Colorado. The best of these specimens show a very rich golden color and excellent gem quality crystals. This piece is comprised of dozens of gemmy, sharp, lustrous, rich golden color Barites sitting on a bed of tan colored Siderite "discs". This mine is long defunct and ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
RRUFF Project Specimen ID: R050272 Locality: Eagle mine, Gillman, Colorado, USA Source: University of Arizona Mineral Museum 13548 Gray-white rhombohedral crystals
© Rruff Project
Gilman Mining District, Eagle County, Colorado, USA
A beautiful, showy and pristine specimen of super-brilliant brassy and striated pyritohedrons with sphalerite crystal clusters scattered on the pyrite faces from the famous and now-closed Gilman District of Colorado. 5.3 x 3.4 x 2.6 cm
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
50 x 30 mm specimen of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.6 x 3.7 x 3.1 cm. Many sharp, attractive, very well-formed, classic, tetrahedral Freibergite crystals up to 2.5 mm are associated with well-formed golden crystals of Chalcopyrite and soft pink-beige "rosettes" of Siderite with minor Quartz. This specimen was a gift from the well-known Colorado collector Hall Miller to Richard Kosnar in late ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Apatite crystals on pyrite. Specimen from the collection of Bengie Kuhling 1974. Scale at bottom of image is an inch with a rule at one cm.
© Rock Currier
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
6.1 x 3.9 x 3.2 cm. An OLD-TIME, showy and extremely rich silver ore combination specimen from the famous Eagle Mine of Colorado. Barbed, spinel-twinned silver crystals to 4.8 cm! saturate the matrix, which is solid pastel-pink rhodochrosite! The silvers have a variable patina, which adds to the attractiveness. Hefty for its size at 110 grams. A ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Rhodochrosite, pyrite, and sphalerite, with minor quartz, turned. Purchased at Tucson Electric Park 2014. Collection of Dennis Tryon. **
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.2 x 3.5 x 2.2 cm, 57.7 g This specimen consists of black sphalerite crystals with cream-coloured siderite crystals. Note: This specimen is already in the mindat database: http://www.mindat.org/photo-11397.html
© 2009 Eric C. Graff
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Brilliant lustrous brassy crystals of pyrite to 1 cm in size are completely and thickly coating the top of this 8.7 x 8.7 x 2.7 cm massive pyrite matrix. There is very minor chipping present; overall this is in good shape damage-wise. A Colorado classic! Ex Don Belsher Collection.
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
An extremely lustrous, sparkling and colorful specimen of the jet-black, Iron-rich variety of Sphalerite called Marmatite, accented by tan crystals of Ankerite up to 7 mm. in size. Also present on the upper left side of the specimen are many lustrous micro crystals of Pyrite and on the lower left portion are several crude crystals of Galena. The ...
© Russ Rizzo & Cal Neva Mineral Company
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A large 10.0 x 7.2 x 6.3 cm matrix, this covered by sparkling black sphalerite crystals to 0.55 cm in size. Scattered throughout are brown ankerite crystals to 0.7 cm. Overall in good condition. Nice cabinet piece for this famous locality.
© Dan & Diana Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Opaque black iron-rich sphalerite (variety 'marmatite') with minor tan tabular-lenticular siderite crystals and pyrite.
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 4.2 by 3.2 cms specimen of small, rounded and light brown crystals on Pyrite and Shalerite crystals. JSS specimen and photograph.
© 2006 JSS
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 7.9 x 5.7 x 3.5 cm matrix, the top completely covered by tan colored platy flattened rhombohedral crystals of siderite to 6 mm in size. Very clean of damage; upon close inspection the crystals are slightly translucent. A good example from this noted Colorado locality! Ex Don Belsher collection; a data card comes with the piece dating his ...
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A 9.8 x 6.4 x 6.3 cm matrix of crystallized bright brassy pyrite, this hosting crystals of galena to 2.0 cm and sphalerite to 1.8 cm. In good condition overall. Nice locality piece.
© Dan & Diana Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
9.8 x 5.4 x 3.5 cm. An old-time specimen of some note for the locality because of the richness and quality of the pyrrhotite crystallization. This is nicely perched on contrasting pink rhodochrosite. From an old collection. Joe Budd photos.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.1 x 4.0 x 2.8 cm. The Eagle mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a good representative Eagle mine Pyrite showing typical striated pyritohedra with sharp, lustrous faces. Ex. Jaime Bird Collection.
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
10.3 x 7.8 x 3.8 cm Largest Tetrahedrite: 5 mm A rarely seen specimen of the highly sought after Silver-bearing Tetrahedrite on charmingly contrasting white rhombs of Dolomite measuring up to 1.8 cm from the Eagle Mine (more properly the New Jersey Zinc Eagle Mine) near the ghost town of Gilman. Most of the Tetrahedrite from this locality ...
© Brian Kosnar - Mineral Classics
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Subject: 28 mm x 28 mm. Photograph by Peter Cristofono.
© 2006 Peter Cristofono
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.4 x 3.3 x 2.6 cm. These classic Rhodochrosite specimens from the Eagle mine are some of the most recognizable and attractive Rhodochrosites from Colorado. They are not the typical blocky rhombic habit like those seen from the Sweet Home, but rather highly compressed rhombs that usually form beautiful "rosettes". This piece hosts dozens of sharp, ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Golden baryte crystals on a siderite matrix from the Eagle Mine, Gilman, Colorado. The largest baryte (upper right) is 1 cm across and the whole specimen is 7.5 cm across. The reverse side is composed entirely of small, brown, discs of siderite. Collection of J. Nemitz.
© J. Nemitz
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Black sphalerite (var. marmatite) to 6 mm exhibiting striated faces, hopper growth features, and iridescence; with dull gray galena crystals to 8 mm with orange and white overgrowths of an unknown mineral, also a few disk-shaped siderite crystals. This specimen is a small piece of a much larger specimen that deteriorated and crumbled into many ...
© Lawrence Violett
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12.2 x 7.8 x 3.7 cm. The Eagle mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a superb piece of Eagle mine Pyrite showing classic striated pyritohedra with sharp, lustrous faces. The largest crystal measures 1.4 cm across, and the piece is in fantastic shape overall. A great full sized cabinet piece of this well ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Cluster of striated and etched crystals of polybasite. Specimen 3.2 cm left to right. Collection and photograph Norman King.
© Norman King
State Bridge area, Eagle County, Colorado, USA
4.2 x 3.2 x 2.3 cm. Recently, a local digger in Colorado found some very interesting Pyrite specimens in the State Bridge area in Colorado. Typically, the specimens from this area are found in shale, but these new specimens are essentially crystallized spherical "floater" aggregates of Pyrite, which have formed over/around Ammonite fossils. It is ...
© Rob Lavinsky & irocks.com
Gilman, Gilman Mining District, Eagle County, Colorado, USA
From an American classic locality. Although originally labeled as Bravoite in reference to the grayish coating on Pyrite crystals, our analysis didn't confirm the existence of Bravoite. Subsequent consultations also confirm that it is not Bravoite and, even knowing that similar specimens could also contain Molybdenite, this species didn't appear ...
© Fabre Minerals https://www.fabreminerals.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
12.7 x 10.0 x 3.1 cm. The Eagle Mine is probably best known for its pyritohedral Pyrite specimens. This cluster is a fine specimen of Eagle Mine Pyrite showing classic striated pyritohedra with sharp, highly lustrous faces. The largest crystal measures 2.7 cm across, and the piece is in excellent condition overall, and has superb luster for the ...
© Rob Lavinsky & irocks.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
This specimen consists of a complex cluster of brilliant golden Pyrite crystals that host a lustrous 'disc' of pink Rhodochrosite. There are some thin, platy crystals of Pyrrhotite in association and some massive Sphalerite on the reverse as well. Collected in 1975. Specimen size is 2.06cm x 1.73cm x .98cm.
© Jasun McAvoy & mineralman.com
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
A flattish 9.6 x 7.2 x 2.7 cm matrix, the top almost completely covered by brownish tan opaque lenticular crystals of siderite to 11 mm in size. Minor black sphalerite in association. Overall very clean of damage. Nice hand sample for this noted locality. Ex Don Belsher collection.
© Dan Weinrich Minerals
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
Pyrite. Specimen is from the Roebling collection at the Smithsonian Institute, Museum of Natural History #R15115 (1973). Scale at bottom of image is an inch with a rule at one cm.
© Rock Currier
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
30 mm wide FOV, specimen of black sphalerite. RFC M1836.
© 2007 Michael C. Roarke
Fulford Mining District, Eagle County, Colorado, USA
Fluorapatite has been known to have come from this area in Colorado. Good ones seem to seldom make it out of the state. The miniature shown here is of excellent quality. This is a single terminated crystal measuring 3.8 x 2 x 2.1 cm in size, very glassy in luster and showing a lot of translucency. The back right side is not quite complete, ...
© Dan Weinrich Minerals
Wolcott, Eagle County, Colorado, USA
A example of common opal from the road cut in Tertiary basalt north of Wolcott, showing the specimen in ambient light on the left, and exhibiting bright green fluorescence in short-wave ultraviolet light on the right. Currently in the Polhemus collection, catalog # POL-MIN-2018-0569. Dan A. Polhemus photo, 2019.
© Dan A. Polhemus, 2019
Eagle Mine, Gilman, Gilman Mining District, Eagle County, Colorado, USA
4.6 x 3.7 x 3.1 cm. Many sharp, attractive, very well-formed, classic, tetrahedral Freibergite crystals up to 2.5 mm are associated with well-formed golden crystals of Chalcopyrite and soft pink-beige "rosettes" of Siderite with minor Quartz. This specimen was a gift from the well-known Colorado collector Hall Miller to Richard Kosnar in late ...
© Rob Lavinsky & irocks.com
