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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):
45.92318,-112.41535
GeoHash:
G#: c80j3bj9u
GRN:
N31W57
Type:
Pass
KΓΆppen climate type:
BSk : Cold semi-arid (steppe) climate
Mindat Locality ID:
187565
Long-form identifier:
mindat:1:2:187565:5
GUID (UUID V4):
d3afade1-9040-4662-aadd-32401f5adcbb


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:

β“˜ Albite
Formula: Na(AlSi3O8)
β“˜ 'Allanite Group'
Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
β“˜ Anatase
Formula: TiO2
β“˜ Astrophyllite
Formula: K2NaFe2+7Ti2Si8O26(OH)4F
β“˜ Bertrandite
Formula: Be4(Si2O7)(OH)2
β“˜ Beryl
Formula: Be3Al2(Si6O18)
β“˜ Brookite
Formula: TiO2
β“˜ Cosalite
Formula: Pb2Bi2S5
β“˜ Danburite
Formula: CaB2Si2O8
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜ 'Feldspar Group'
β“˜ Ilmenite
Formula: Fe2+TiO3
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ 'Monazite'
Formula: REE(PO4)
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Phenakite
Formula: Be2SiO4
β“˜ Quartz
Formula: SiO2
β“˜ Quartz var. Amethyst
Formula: SiO2
β“˜ Quartz var. Smoky Quartz
Formula: SiO2
β“˜ Rutile
Formula: TiO2
β“˜ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Crystals up to 5cm
β“˜ Spessartine
Formula: Mn2+3Al2(SiO4)3
β“˜ Titanite
Formula: CaTi(SiO4)O
β“˜ Zircon
Formula: Zr(SiO4)

Gallery:

(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)β“˜ 'Allanite Group'
Be3Al2(Si6O18)β“˜ Beryl
Pb2Bi2S5β“˜ Cosalite
Be2SiO4β“˜ Phenakite
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)β“˜ Schorl

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Cosalite2.JB.10Pb2Bi2S5
Group 4 - Oxides and Hydroxides
β“˜Ilmenite4.CB.05Fe2+TiO3
β“˜Quartz
var. Smoky Quartz		4.DA.05SiO2
β“˜var. Amethyst4.DA.05SiO2
β“˜4.DA.05SiO2
β“˜Rutile4.DB.05TiO2
β“˜Anatase4.DD.05TiO2
β“˜Brookite4.DD.10TiO2
Group 9 - Silicates
β“˜Phenakite9.AA.05Be2SiO4
β“˜Spessartine9.AD.25Mn2+3Al2(SiO4)3
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Titanite9.AG.15CaTi(SiO4)O
β“˜Bertrandite9.BD.05Be4(Si2O7)(OH)2
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Beryl9.CJ.05Be3Al2(Si6O18)
β“˜Schorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
β“˜Astrophyllite9.DC.05K2NaFe2+7Ti2Si8O26(OH)4F
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Albite9.FA.35Na(AlSi3O8)
β“˜Danburite9.FA.65CaB2Si2O8
Unclassified
β“˜'Monazite'-REE(PO4)
β“˜'Feldspar Group'-
β“˜'Allanite Group'-(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
Hβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Hβ“˜ BertranditeBe4(Si2O7)(OH)2
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
BeBeryllium
Beβ“˜ BertranditeBe4(Si2O7)(OH)2
Beβ“˜ BerylBe3Al2(Si6O18)
Beβ“˜ PhenakiteBe2SiO4
BBoron
Bβ“˜ DanburiteCaB2Si2O8
Bβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Quartz var. AmethystSiO2
Oβ“˜ AnataseTiO2
Oβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Oβ“˜ BertranditeBe4(Si2O7)(OH)2
Oβ“˜ BrookiteTiO2
Oβ“˜ BerylBe3Al2(Si6O18)
Oβ“˜ DanburiteCaB2Si2O8
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MonaziteREE(PO4)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ PhenakiteBe2SiO4
Oβ“˜ QuartzSiO2
Oβ“˜ RutileTiO2
Oβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oβ“˜ Quartz var. Smoky QuartzSiO2
Oβ“˜ SpessartineMn32+Al2(SiO4)3
Oβ“˜ TitaniteCaTi(SiO4)O
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
FFluorine
Fβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Naβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ BerylBe3Al2(Si6O18)
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alβ“˜ SpessartineMn32+Al2(SiO4)3
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Quartz var. AmethystSiO2
Siβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Siβ“˜ BertranditeBe4(Si2O7)(OH)2
Siβ“˜ BerylBe3Al2(Si6O18)
Siβ“˜ DanburiteCaB2Si2O8
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ PhenakiteBe2SiO4
Siβ“˜ QuartzSiO2
Siβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siβ“˜ Quartz var. Smoky QuartzSiO2
Siβ“˜ SpessartineMn32+Al2(SiO4)3
Siβ“˜ TitaniteCaTi(SiO4)O
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
PPhosphorus
Pβ“˜ MonaziteREE(PO4)
SSulfur
Sβ“˜ CosalitePb2Bi2S5
KPotassium
Kβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ DanburiteCaB2Si2O8
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ TitaniteCaTi(SiO4)O
TiTitanium
Tiβ“˜ AnataseTiO2
Tiβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Tiβ“˜ BrookiteTiO2
Tiβ“˜ IlmeniteFe2+TiO3
Tiβ“˜ RutileTiO2
Tiβ“˜ TitaniteCaTi(SiO4)O
MnManganese
Mnβ“˜ SpessartineMn32+Al2(SiO4)3
FeIron
Feβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
PbLead
Pbβ“˜ CosalitePb2Bi2S5
BiBismuth
Biβ“˜ CosalitePb2Bi2S5

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33(1), 58-64.
Gobla, Michael J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87 (3) 208-240 doi:10.1080/00357529.2012.676825
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