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Biotite from
Northwestern Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA


Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Northwestern Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:178174
Long-form Identifier:1:3:178174:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.2km (0.1 miles) ⓘSarsfield Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
0.6km (0.4 miles) ⓘContinental Pit, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
0.9km (0.5 miles) ⓘMontgomery Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
1.5km (0.9 miles) ⓘAltona Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
3.1km (1.9 miles) ⓘGem Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
4.4km (2.7 miles) ⓘSteward Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
4.5km (2.8 miles) ⓘLexington Mine, Walkerville, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
19.1km (11.9 miles) ⓘPohndorf Mine, Toll Mountain, Boulder Batholith, Jefferson County, Montana, USA
36.8km (22.9 miles) ⓘFree Enterprise Mine (Silver Bell), Boulder, Boulder Mining District, Boulder Batholith, Jefferson County, Montana, USA
37.4km (23.3 miles) ⓘGolden Sunlight Mine, Whitehall Mining District (Cardwell Mining District), Jefferson County, Montana, USA
References
Weed, W.H. (1912) Geology and ore deposits of the Butte district, Montana. Professional Paper 74. US Geological Survey doi:10.3133/pp74
 
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