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Homestake Pass, Boulder Batholith, Jefferson County, Montana, USAi
| Regional Level Types | |
|---|---|
| Homestake Pass | Pass |
| Boulder Batholith | Batholith |
| Jefferson County | County |
| Montana | State |
| USA | Country |
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Latitude & Longitude (WGS84):
45° 55' 23'' North , 112° 24' 55'' West
Latitude & Longitude (decimal):
Type:
Köppen climate 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.
Coordinates shown are for the Homestake Pass in general.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed 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) References: |
| ⓘ 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 References: |
| ⓘ 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: CaTiO(SiO4) |
| ⓘ Zircon Formula: Zr(SiO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cosalite | 2.JB.10 | Pb2Bi2S5 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Quartz var. Amethyst | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| ⓘ | Anatase | 4.DD.05 | TiO2 |
| ⓘ | Brookite | 4.DD.10 | TiO2 |
| Group 9 - Silicates | |||
| ⓘ | Phenakite | 9.AA.05 | Be2SiO4 |
| ⓘ | Spessartine | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Titanite | 9.AG.15 | CaTiO(SiO4) |
| ⓘ | Bertrandite | 9.BD.05 | Be4(Si2O7)(OH)2 |
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Astrophyllite | 9.DC.05 | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Danburite | 9.FA.65 | CaB2Si2O8 |
| 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
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| H | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| Be | Beryllium | |
| Be | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| Be | ⓘ Phenakite | Be2SiO4 |
| B | Boron | |
| B | ⓘ Danburite | CaB2Si2O8 |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Quartz var. Amethyst | SiO2 |
| O | ⓘ Anatase | TiO2 |
| O | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| O | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| O | ⓘ Brookite | TiO2 |
| O | ⓘ Beryl | Be3Al2(Si6O18) |
| O | ⓘ Danburite | CaB2Si2O8 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Monazite Group | REE(PO4) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Phenakite | Be2SiO4 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rutile | TiO2 |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Quartz var. Smoky Quartz | SiO2 |
| O | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| O | ⓘ Titanite | CaTiO(SiO4) |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| F | Fluorine | |
| F | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Quartz var. Amethyst | SiO2 |
| Si | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Si | ⓘ Bertrandite | Be4(Si2O7)(OH)2 |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Danburite | CaB2Si2O8 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Phenakite | Be2SiO4 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Quartz var. Smoky Quartz | SiO2 |
| Si | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | ⓘ Titanite | CaTiO(SiO4) |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| P | Phosphorus | |
| P | ⓘ Monazite Group | REE(PO4) |
| S | Sulfur | |
| S | ⓘ Cosalite | Pb2Bi2S5 |
| K | Potassium | |
| K | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Danburite | CaB2Si2O8 |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Titanite | CaTiO(SiO4) |
| Ti | Titanium | |
| Ti | ⓘ Anatase | TiO2 |
| Ti | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Ti | ⓘ Brookite | TiO2 |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Ti | ⓘ Rutile | TiO2 |
| Ti | ⓘ Titanite | CaTiO(SiO4) |
| Mn | Manganese | |
| Mn | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Fe | Iron | |
| Fe | ⓘ Astrophyllite | K2NaFe72+Ti2[Si4O12]2O2(OH)4F |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Pb | Lead | |
| Pb | ⓘ Cosalite | Pb2Bi2S5 |
| Bi | Bismuth | |
| Bi | ⓘ Cosalite | Pb2Bi2S5 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Falls DomainDomain
- Northern Rocky MountainsWide Rift
USA
- Montana
- Beaverhead–Deerlodge National ForestNational Forest
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Homestake Pass, Boulder Batholith, Jefferson County, Montana, USA