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
Albitite, West Gallatin Mining District, Gallatin County, Montana, USA


Locality type:Outcrop
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 Albitite, West Gallatin Mining District, Gallatin County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:1515513
Long-form Identifier:1:3:1515513:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
19.8km (12.3 miles) ⓘMica Creek Deposit (Mica Mine), Gallatin Range, Gallatin County, Montana, USA
23.4km (14.5 miles) ⓘBeartrap corundum deposit, Madison County, Montana, USA
24.1km (15.0 miles) ⓘGallatin Corundum deposit, Gallatin Gateway, Gallatin County, Montana, USA
24.4km (15.1 miles) ⓘElk Creek corundum deposit (Montana Mine; Gallatin deposit; Flying D), Gallatin County, Montana, USA
31.1km (19.3 miles) ⓘBozeman Corundum Mine, Gallatin Gateway, Gallatin County, Montana, USA
46.0km (28.6 miles) ⓘSkunk Creek outcrops, Madison County, Montana, USA
61.9km (38.4 miles) ⓘGilliam prospect, Madison County, Montana, USA
69.4km (43.1 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
80.7km (50.1 miles) ⓘGolden Sunlight Mine, Whitehall Mining District (Cardwell Mining District), Jefferson County, Montana, USA
86.7km (53.9 miles) ⓘDillon Nickel Deposit (Wolf Creek Nickel Deposit), Ruby Mining District, Beaverhead County, Montana, USA
References
Condit, Cailey B., Kevin H. Mahan, Kelly C. Curtis, and Andreas Möller. (2018) "Dating Metasomatism: Monazite and Zircon Growth during Amphibolite Facies Albitization" Minerals 8, no. 5: 187. https://doi.org/10.3390/min8050187
 
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