Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Biotite from
Calvert Mine (Calvert Hill Mine; Calvert Tungsten Mine; Red Button Mine), Calvert Hill Mining District, Beaverhead 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 Calvert Mine (Calvert Hill Mine; Calvert Tungsten Mine; Red Button Mine), Calvert Hill Mining District, Beaverhead County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:784121
Long-form Identifier:1:3:784121:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
37.1km (23.0 miles) ⓘJacobson Meadows Occurrence, Pioneer Mining District, Beaverhead County, Montana, USA
41.6km (25.8 miles) ⓘCrystal Park Occurrence (Hot Springs Creek; Price Creek), Pioneer Mining District, Beaverhead County, Montana, USA
51.3km (31.9 miles) ⓘSteward Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
51.7km (32.1 miles) ⓘLexington Mine, Walkerville, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
53.2km (33.0 miles) ⓘGem Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
54.7km (34.0 miles) ⓘAltona Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
54.8km (34.0 miles) ⓘMontgomery Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
55.0km (34.2 miles) ⓘContinental Pit, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
55.2km (34.3 miles) ⓘSarsfield Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
55.3km (34.4 miles) ⓘNorthwestern Mine, Butte Mining District (Summit Valley Mining District), Silver Bow County, Montana, USA
References
Gobla, Michael J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87 (3) 208-240 doi:10.1080/00357529.2012.676825
 
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