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⇱ Homestake Pass, Boulder Batholith, Jefferson County, Montana, USA

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Homestake Pass, Boulder Batholith, Jefferson County, Montana, USAi
Regional Level Types
Homestake PassPass
Boulder BatholithBatholith
Jefferson CountyCounty
MontanaState
USACountry

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Latitude & Longitude (WGS84):
45° 55' 23'' North , 112° 24' 55'' West
Latitude & Longitude (decimal):
Type:
Mindat Locality ID:
187565
Long-form identifier:
mindat:1:2:187565:5
GUID (UUID V4):
0


The area 10 miles east of Butte, in and around the Continental Divide, where the Homestake Pluton of the Boulder Batholith outcrops. Numerous aplites, grano-aplites, alaskaites are found throughout the area, and locally these bodies grade into coarse pegmatite. These are graphic granite pegmatites, marking the transition between fine-grained aplite and pegmatite and/or cavities. The Homestake Pluton is found in two separate units, both north and south of the pass (and the interstate highway). The pegmatites are characterized by the presence of boron, as indicated by tourmaline, axinite, and danburite. Tourmaline (schorl) is locally abundant (van Laer, 1979). Numerous pegmatite digs are visible from the road that goes from Homestake Pass to Delmoe Lake, but the specific area in question is restricted to an area roughly two or three miles around Homestake Pass.

Coordinates shown are for the Homestake Pass in general.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ 'Allanite Group'
Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
ⓘ Anatase
Formula: TiO2
ⓘ Astrophyllite
Formula: K2NaFe2+7Ti2[Si4O12]2O2(OH)4F
ⓘ Bertrandite
Formula: Be4(Si2O7)(OH)2
ⓘ Beryl
Formula: Be3Al2(Si6O18)
ⓘ Brookite
Formula: TiO2
ⓘ Cosalite
Formula: Pb2Bi2S5
ⓘ Danburite
Formula: CaB2Si2O8
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ 'Feldspar Group'
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Microcline
Formula: K(AlSi3O8)
ⓘ 'Monazite Group'
Formula: REE(PO4)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Phenakite
Formula: Be2SiO4
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Amethyst
Formula: SiO2
ⓘ Quartz var. Smoky Quartz
Formula: SiO2
ⓘ Rutile
Formula: TiO2
ⓘ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Crystals up to 5cm
ⓘ Spessartine
Formula: Mn2+3Al2(SiO4)3
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ Zircon
Formula: Zr(SiO4)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘCosalite2.JB.10Pb2Bi2S5
Group 4 - Oxides and Hydroxides
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘQuartz
var. Amethyst		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘvar. Smoky Quartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
ⓘAnatase4.DD.05TiO2
ⓘBrookite4.DD.10TiO2
Group 9 - Silicates
ⓘPhenakite9.AA.05Be2SiO4
ⓘSpessartine9.AD.25Mn2+3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘBertrandite9.BD.05Be4(Si2O7)(OH)2
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘAstrophyllite9.DC.05K2NaFe2+7Ti2[Si4O12]2O2(OH)4F
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘMicrocline9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘDanburite9.FA.65CaB2Si2O8
Unclassified
ⓘ'Feldspar Group'-
ⓘ'Monazite Group'-REE(PO4)
ⓘ'Allanite Group'-(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
Hⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Hⓘ BertranditeBe4(Si2O7)(OH)2
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
BeBeryllium
Beⓘ BertranditeBe4(Si2O7)(OH)2
Beⓘ BerylBe3Al2(Si6O18)
Beⓘ PhenakiteBe2SiO4
BBoron
Bⓘ DanburiteCaB2Si2O8
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Quartz var. AmethystSiO2
Oⓘ AnataseTiO2
Oⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Oⓘ BertranditeBe4(Si2O7)(OH)2
Oⓘ BrookiteTiO2
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ DanburiteCaB2Si2O8
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ IlmeniteFe2+TiO3
Oⓘ MicroclineK(AlSi3O8)
Oⓘ Monazite GroupREE(PO4)
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ PhenakiteBe2SiO4
Oⓘ QuartzSiO2
Oⓘ RutileTiO2
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ Quartz var. Smoky QuartzSiO2
Oⓘ SpessartineMn32+Al2(SiO4)3
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ ZirconZr(SiO4)
Oⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
FFluorine
Fⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ BerylBe3Al2(Si6O18)
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ MicroclineK(AlSi3O8)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ SpessartineMn32+Al2(SiO4)3
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Quartz var. AmethystSiO2
Siⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Siⓘ BertranditeBe4(Si2O7)(OH)2
Siⓘ BerylBe3Al2(Si6O18)
Siⓘ DanburiteCaB2Si2O8
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ MicroclineK(AlSi3O8)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PhenakiteBe2SiO4
Siⓘ QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ Quartz var. Smoky QuartzSiO2
Siⓘ SpessartineMn32+Al2(SiO4)3
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ ZirconZr(SiO4)
Siⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
PPhosphorus
Pⓘ Monazite GroupREE(PO4)
SSulfur
Sⓘ CosalitePb2Bi2S5
KPotassium
Kⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Kⓘ MicroclineK(AlSi3O8)
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ DanburiteCaB2Si2O8
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ TitaniteCaTi(SiO4)O
TiTitanium
Tiⓘ AnataseTiO2
Tiⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Tiⓘ BrookiteTiO2
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ RutileTiO2
Tiⓘ TitaniteCaTi(SiO4)O
MnManganese
Mnⓘ SpessartineMn32+Al2(SiO4)3
FeIron
Feⓘ AstrophylliteK2NaFe72+Ti2[Si4O12]2O2(OH)4F
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ IlmeniteFe2+TiO3
Feⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
ZrZirconium
Zrⓘ ZirconZr(SiO4)
PbLead
Pbⓘ CosalitePb2Bi2S5
BiBismuth
Biⓘ CosalitePb2Bi2S5

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