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
Gallatin Corundum deposit, Gallatin Gateway, Gallatin County, Montana, USA


Locality type:Deposit
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
Associated Minerals Based on Photo Data:
Corundum1
Feldspar Group1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Gallatin Corundum deposit, Gallatin Gateway, Gallatin County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:571199
Long-form Identifier:1:3:571199:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.0km (0.6 miles) ⓘElk Creek corundum deposit (Montana Mine; Gallatin deposit; Flying D), Gallatin County, Montana, USA
8.2km (5.1 miles) ⓘBozeman Corundum Mine, Gallatin Gateway, Gallatin County, Montana, USA
15.6km (9.7 miles) ⓘBeartrap corundum deposit, Madison County, Montana, USA
19.5km (12.1 miles) ⓘMica Creek Deposit (Mica Mine), Gallatin Range, Gallatin County, Montana, USA
24.1km (15.0 miles) ⓘAlbitite, West Gallatin Mining District, Gallatin County, Montana, USA
49.9km (31.0 miles) ⓘGilliam prospect, Madison County, Montana, USA
53.2km (33.0 miles) ⓘSkunk Creek outcrops, Madison County, Montana, USA
64.9km (40.3 miles) ⓘGolden Sunlight Mine, Whitehall Mining District (Cardwell Mining District), Jefferson County, Montana, USA
82.4km (51.2 miles) ⓘCrevasse Mountain Mine (Jardine; Mineral Hill Mine; TVX Mineral Hill 0300670001; Jardine Mine; Jardine Jv), Crevasse Mining District (Crevice Mining District; Jardine Mining District), Park County, Montana, USA
85.5km (53.1 miles) ⓘPohndorf Mine, Toll Mountain, Boulder Batholith, Jefferson County, Montana, USA
References
Heinrich, W. E. 1948. Pegmatite Mineral Deposits in Montana, Montana Bureau of Mines and Geology, Memoir 28.
 
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