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Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of micronugget of Iridian Ferronickelplatinum composed by crude cubic and cubooctahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Dark in BSE material, filling cavities, is limonite with admixture of some unidentified iron phosphate. Compositional data are available on the daughter photo. For exact size ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of fragment Polyxene micronugget from the photo ID 685807. Abundant inclusions of more darker in BSE distorted octahedral crystals of Iridian Hollingworthite within more bright Polyxene matrix. Analythical data are available on the daughter photo. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of silvery-white Ferronickelplatinum composed by intergrowth of crude cubooctahedral crystals from heavy concentrate, washed on Bir Bir river banks. Associated minerals are black Magnesiochromite and brown Goethite. Compositional data are available on the daughter photo. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Platinum nugget (4 mm long) with rusty coating and black inclusion in center.
© Van King
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronuggets of Polyxene from strong magnetic fraction of heavy concentrate washed on Bir Bir river banks. All these grains jump to even weak magnet. Three grains in the center demonstrating crystaline faces of cube. Other grains has both own crystalline forms and imprints of chromite crystals of a mother dunite rock. Composition of the specimen ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget composed by cubic crystals of Polyxene with rich impregnations of Hollingworthite, Iridian Hollingworthite and Rh-bearing Sperrylite. For more info look daughter photos and photo ID 685797. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Reflected light digital image in oil of kingstonite in association with osmium, laurite and ferrorhodsite in an isoferroplatinum matrix. This is the original nugget in which "prassoite" (now shown to be in the ferrorhodsite-cuprorhodsite series) was reported by Gordon Kingston after whom the mineral kingstonite was named. Type specimen is in ...
© Natural History Museum
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of Polyxene micronugget from previous photo. It is strong magnetic and jump to even weak magnet. This micronugget demonstrating intergrowth of platy crystalline individes with imprints of chromite crystals of a mother dunite rock. Composition of the specimen is close to Pt2Fe and is between compositional fields of ordered minerals ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Nonmagnetic fraction of heavy concentrate. It mainly composed by platy grains of native Gold (part of which are covered by brown Limonite films) and black grains of Magnesiochromite. Minor transparent colourless Zircon crystals also are visible (at the upper right and the lower left parts of a pile). Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of the another Polyxene micronugget from the mother photo. It is strong magnetic and jump to even weak magnet. This micronugget is heavily worn out but still preserved some imprints of chromite crystals of a mother dunite rock. Composition of the specimen is close to Pt2Fe and is between compositional fields of ordered minerals ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of micronugget of Nickeloan Tulameenite composed by crude flattened octahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Dark in BSE material, filling cavities, is Limonite. Compositional data are available on the daughter photo. For exact size look the micrometer bar. Pavel M. Kartashov analytical ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of Antimonian Tulameenite from strong magnetic fraction of heavy concentrates of Bir-Bir river. Color of this variety is metallic pinkish-grey more darker than usual Tulameenite is. Compositional data are available on the daughter photo. Pavel M. Kartashov analytical data, photos and collection.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of the same micronugget composed by cubic crystals of Polyxene with rich impregnations of Hollingworthite, Iridian Hollingworthite and Rh-bearing Sperrylite. For more info look daughter photos and photo ID 685797. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of part of Polyxene micronugget in COMPO mode. Dark in BSE crystals of rhodian Laurite within bright Polyxene matrix. Analytical data are available at the daughter photo. Pavel M. Kartashov analytica, collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The same micronugget of Nickeloan Tulameenite amongst waterworn grains of more bright-white Polyxene and Isoferroplatinum from the heavy concentrate, washed on Bir Bir river banks. Nickel content in the Tulameenite make it more whitish, without pinkish tinges so typical for usual Tulameenites. Pavel M. Kartashov analytical data, photos and ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image in BSE (COMPO mode). Micronugget of Antimonian Tulameenite from strong magnetic fraction of heavy concentrates of Bir-Bir river. The sample composed by intergrowths of crude bipyramidal ("octahedrons") crystals and is covered by dark in BSE Limonite films. Compositional data are available on the daughter photo. Pavel M. Kartashov ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of Polyxene micronugget in COMPO mode. Dark in BSE crystals of rhodian Laurite (at the right part) within bright Polyxene matrix. Analytical data are available at the daughter photo. Pavel M. Kartashov analytica, collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of Nickeloan Tulameenite composed by crude flattened octahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Associating mineral is Limonite filling cavities. Compositional data are available on the daughter photo. Pavel M. Kartashov analytical data, photos and collection.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Polyxene (native Pt-Fe alloy) grains from the PGE placers of Bir Bir river, Ethiopia. Part of the sample collected and analyzed by Dr. Pavel Kartashov. Purchased from Dr. Pavel Kartashov in 2018.
© Cheolwoo Kim
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image in BSE of of Ferronickelplatinum micronugget composed by intergrowth of crude cubooctahedral crystals. Associated minerals are darker in BSE Magnesiochromite and more lighter Goethite. Compositional data are available on the daughter photo. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Black magnetite sands are visible near water line. May of 2004.
© Pavel M. Kartashov photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The rightmost person is Mr. Banty - owner of Yubdo mine. Alfe is tributary of Yubdo river.
© Pavel M. Kartashov photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Bir-Bir river valley in the area of striation with Alfe river (in the left part of the photo). View from the top of Yubdo mount. "Wet season" coming, so clouds are dark.
© Pavel M. Kartashov photo
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The very early Youbdo Stream placer platinum mining, ca. 1930. Vintage picture postcard, photographer "Fototeca R. Gov. Galla Sidama”, printed by "Stab. Graf. Cesare Capello - Milano", published by "Ediz. Bottega D'Arte - Gimma." G. Grundmann collection.
© Ediz. Bottega D'Arte - Gimma.
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The very early Youbdo Stream placer platinum mining, ca. 1930. Vintage picture postcard, photographer "Fototeca R. Gov. Galla Sidama”, printed by "Stab. Graf. Cesare Capello - Milano", published by "Ediz. Bottega D'Arte - Gimma." G. Grundmann collection.
© Ediz. Bottega D'Arte - Gimma.
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
EDS spectrum of Ferronickelplatinum from Bir Bir river. Empirical formula of the mineral, calculated from analysis, corresponding with the spectrum, is Pt2.00Fe1.00(Ni0.70Fe0.21Cu0.09) with Ni content 15.84 mas.%. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
"Ethiopians pan the 'seventh metal' in mud holes 250 miles west of Addis Ababa". Vintage photo print, photographer Hans Morf. In: Article by Lonnelle Davison "Platinum in the World's Work", The National Geographic Magazine, Volume LXXII, No. 3, September 1937, p. 354.
© National Geographic Society, Washington, D.C.
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of micronugget of Iridian Ferronickelplatinum composed by crude cubic and cubooctahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Dark in BSE material, filling cavities, is limonite with admixture of some unidentified iron phosphate. Compositional data are available on the daughter photo. For exact size ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of fragment Polyxene micronugget from the photo ID 685807. Abundant inclusions of more darker in BSE distorted octahedral crystals of Iridian Hollingworthite within more bright Polyxene matrix. Analythical data are available on the daughter photo. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of silvery-white Ferronickelplatinum composed by intergrowth of crude cubooctahedral crystals from heavy concentrate, washed on Bir Bir river banks. Associated minerals are black Magnesiochromite and brown Goethite. Compositional data are available on the daughter photo. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Platinum nugget (4 mm long) with rusty coating and black inclusion in center.
© Van King
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronuggets of Polyxene from strong magnetic fraction of heavy concentrate washed on Bir Bir river banks. All these grains jump to even weak magnet. Three grains in the center demonstrating crystaline faces of cube. Other grains has both own crystalline forms and imprints of chromite crystals of a mother dunite rock. Composition of the specimen ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget composed by cubic crystals of Polyxene with rich impregnations of Hollingworthite, Iridian Hollingworthite and Rh-bearing Sperrylite. For more info look daughter photos and photo ID 685797. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Reflected light digital image in oil of kingstonite in association with osmium, laurite and ferrorhodsite in an isoferroplatinum matrix. This is the original nugget in which "prassoite" (now shown to be in the ferrorhodsite-cuprorhodsite series) was reported by Gordon Kingston after whom the mineral kingstonite was named. Type specimen is in ...
© Natural History Museum
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of Polyxene micronugget from previous photo. It is strong magnetic and jump to even weak magnet. This micronugget demonstrating intergrowth of platy crystalline individes with imprints of chromite crystals of a mother dunite rock. Composition of the specimen is close to Pt2Fe and is between compositional fields of ordered minerals ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Nonmagnetic fraction of heavy concentrate. It mainly composed by platy grains of native Gold (part of which are covered by brown Limonite films) and black grains of Magnesiochromite. Minor transparent colourless Zircon crystals also are visible (at the upper right and the lower left parts of a pile). Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of Antimonian Tulameenite from strong magnetic fraction of heavy concentrates of Bir-Bir river. Color of this variety is metallic pinkish-grey more darker than usual Tulameenite is. Compositional data are available on the daughter photo. Pavel M. Kartashov analytical data, photos and collection.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of the another Polyxene micronugget from the mother photo. It is strong magnetic and jump to even weak magnet. This micronugget is heavily worn out but still preserved some imprints of chromite crystals of a mother dunite rock. Composition of the specimen is close to Pt2Fe and is between compositional fields of ordered minerals ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of micronugget of Nickeloan Tulameenite composed by crude flattened octahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Dark in BSE material, filling cavities, is Limonite. Compositional data are available on the daughter photo. For exact size look the micrometer bar. Pavel M. Kartashov analytical ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of the same micronugget composed by cubic crystals of Polyxene with rich impregnations of Hollingworthite, Iridian Hollingworthite and Rh-bearing Sperrylite. For more info look daughter photos and photo ID 685797. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov collection and photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of part of Polyxene micronugget in COMPO mode. Dark in BSE crystals of rhodian Laurite within bright Polyxene matrix. Analytical data are available at the daughter photo. Pavel M. Kartashov analytica, collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The same micronugget of Nickeloan Tulameenite amongst waterworn grains of more bright-white Polyxene and Isoferroplatinum from the heavy concentrate, washed on Bir Bir river banks. Nickel content in the Tulameenite make it more whitish, without pinkish tinges so typical for usual Tulameenites. Pavel M. Kartashov analytical data, photos and ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Micronugget of Nickeloan Tulameenite composed by crude flattened octahedral crystals intergrowth from heavy concentrate, washed on Bir Bir river banks. Associating mineral is Limonite filling cavities. Compositional data are available on the daughter photo. Pavel M. Kartashov analytical data, photos and collection.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image in BSE (COMPO mode). Micronugget of Antimonian Tulameenite from strong magnetic fraction of heavy concentrates of Bir-Bir river. The sample composed by intergrowths of crude bipyramidal ("octahedrons") crystals and is covered by dark in BSE Limonite films. Compositional data are available on the daughter photo. Pavel M. Kartashov ...
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image of Polyxene micronugget in COMPO mode. Dark in BSE crystals of rhodian Laurite (at the right part) within bright Polyxene matrix. Analytical data are available at the daughter photo. Pavel M. Kartashov analytica, collection and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Polyxene (native Pt-Fe alloy) grains from the PGE placers of Bir Bir river, Ethiopia. Part of the sample collected and analyzed by Dr. Pavel Kartashov. Purchased from Dr. Pavel Kartashov in 2018.
© Cheolwoo Kim
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
SEM image in BSE of of Ferronickelplatinum micronugget composed by intergrowth of crude cubooctahedral crystals. Associated minerals are darker in BSE Magnesiochromite and more lighter Goethite. Compositional data are available on the daughter photo. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Black magnetite sands are visible near water line. May of 2004.
© Pavel M. Kartashov photo
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The very early Youbdo Stream placer platinum mining, ca. 1930. Vintage picture postcard, photographer "Fototeca R. Gov. Galla Sidama”, printed by "Stab. Graf. Cesare Capello - Milano", published by "Ediz. Bottega D'Arte - Gimma." G. Grundmann collection.
© Ediz. Bottega D'Arte - Gimma.
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The rightmost person is Mr. Banty - owner of Yubdo mine. Alfe is tributary of Yubdo river.
© Pavel M. Kartashov photo
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
Bir-Bir river valley in the area of striation with Alfe river (in the left part of the photo). View from the top of Yubdo mount. "Wet season" coming, so clouds are dark.
© Pavel M. Kartashov photo
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
The very early Youbdo Stream placer platinum mining, ca. 1930. Vintage picture postcard, photographer "Fototeca R. Gov. Galla Sidama”, printed by "Stab. Graf. Cesare Capello - Milano", published by "Ediz. Bottega D'Arte - Gimma." G. Grundmann collection.
© Ediz. Bottega D'Arte - Gimma.
Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
EDS spectrum of Ferronickelplatinum from Bir Bir river. Empirical formula of the mineral, calculated from analysis, corresponding with the spectrum, is Pt2.00Fe1.00(Ni0.70Fe0.21Cu0.09) with Ni content 15.84 mas.%. Pavel M. Kartashov collection, analytical data and photo.
© Pavel M. Kartashov collection & photo
Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia
"Ethiopians pan the 'seventh metal' in mud holes 250 miles west of Addis Ababa". Vintage photo print, photographer Hans Morf. In: Article by Lonnelle Davison "Platinum in the World's Work", The National Geographic Magazine, Volume LXXII, No. 3, September 1937, p. 354.
© National Geographic Society, Washington, D.C.
