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

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Key
Latitude & Longitude (WGS84):
45° 55' 23'' North , 112° 24' 55'' West
Latitude & Longitude (decimal):
Locality type:


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 Strunz Dana Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Anatase
Formula: TiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Astrophyllite
Formula: K2NaFe2+7Ti2Si8O28(OH)4F
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Bertrandite
Formula: Be4(Si2O7)(OH)2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Beryl
Formula: Be3Al2(Si6O18)
Reference: William C. van Laer
Brookite
Formula: TiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Cosalite
Formula: Pb2Bi2S5
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Danburite
Formula: CaB2Si2O8
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
'Feldspar Group'
Reference: Rob Lavinsky specimen
Ilmenite
Formula: Fe2+TiO3
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Microcline
Formula: K(AlSi3O8)
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
'Monazite'
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Phenakite
Formula: Be2SiO4
Reference: William C. van Laer
Quartz
Formula: SiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Quartz var: Amethyst
Formula: SiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Quartz var: Smoky Quartz
Formula: SiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Rutile
Formula: TiO2
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Crystals up to 5cm
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64. Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Titanite
Formula: CaTi(SiO4)O
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.
Zircon
Formula: Zr(SiO4)
Reference: van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33, 58-64.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Cosalite2.JB.10Pb2Bi2S5
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Brookite4.DD.10TiO2
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Astrophyllite9.DC.05K2NaFe2+7Ti2Si8O28(OH)4F
Bertrandite9.BD.05Be4(Si2O7)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Danburite9.FA.65CaB2Si2O8
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phenakite9.AA.05Be2SiO4
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Titanite9.AG.15CaTi(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Feldspar Group'-
'Monazite'-

List of minerals arranged by Dana 8th Edition classification

Group 3 - SULFOSALTS
2.5 < ø < 3
Cosalite3.5.9.1Pb2Bi2S5
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Anatase4.4.4.1TiO2
Brookite4.4.5.1TiO2
Rutile4.4.1.1TiO2
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Bertrandite56.1.1.1Be4(Si2O7)(OH)2
Si2O7 Groups and O, OH, F, and H2O with[Si2O7] with borate groups
Danburite56.3.1.1CaB2Si2O8
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
Astrophyllite69.1.1.1K2NaFe2+7Ti2Si8O28(OH)4F
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Feldspar Group'-
'Monazite'-
Quartz
var: Amethyst
-SiO2
var: Smoky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H BertranditeBe4(Si2O7)(OH)2
H AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
H MuscoviteKAl2(AlSi3O10)(OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be BertranditeBe4(Si2O7)(OH)2
Be PhenakiteBe2SiO4
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B DanburiteCaB2Si2O8
OOxygen
O Quartz (var: Smoky Quartz)SiO2
O Quartz (var: Amethyst)SiO2
O MicroclineK(AlSi3O8)
O AlbiteNa(AlSi3O8)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O TitaniteCaTi(SiO4)O
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O SpessartineMn32+Al2(SiO4)3
O IlmeniteFe2+TiO3
O ZirconZr(SiO4)
O DanburiteCaB2Si2O8
O BerylBe3Al2(Si6O18)
O RutileTiO2
O BertranditeBe4(Si2O7)(OH)2
O AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
O AnataseTiO2
O BrookiteTiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O PhenakiteBe2SiO4
O QuartzSiO2
FFluorine
F AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
NaSodium
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
AlAluminium
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpessartineMn32+Al2(SiO4)3
Al BerylBe3Al2(Si6O18)
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Quartz (var: Smoky Quartz)SiO2
Si Quartz (var: Amethyst)SiO2
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si TitaniteCaTi(SiO4)O
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si SpessartineMn32+Al2(SiO4)3
Si ZirconZr(SiO4)
Si DanburiteCaB2Si2O8
Si BerylBe3Al2(Si6O18)
Si BertranditeBe4(Si2O7)(OH)2
Si AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si PhenakiteBe2SiO4
Si QuartzSiO2
SSulfur
S CosalitePb2Bi2S5
KPotassium
K MicroclineK(AlSi3O8)
K AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca TitaniteCaTi(SiO4)O
Ca DanburiteCaB2Si2O8
TiTitanium
Ti TitaniteCaTi(SiO4)O
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
Ti AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
Ti AnataseTiO2
Ti BrookiteTiO2
MnManganese
Mn SpessartineMn32+Al2(SiO4)3
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe IlmeniteFe2+TiO3
Fe AstrophylliteK2NaFe72+Ti2Si8O28(OH)4F
ZrZirconium
Zr ZirconZr(SiO4)
PbLead
Pb CosalitePb2Bi2S5
BiBismuth
Bi CosalitePb2Bi2S5

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
van Laer, W.C. (1979) Tourmalines of the Homestake Pass. Lapidary Journal, 33(1), 58-64.
Gobla, M.J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87(3), 208-240.

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