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
Beartrap corundum deposit, Madison 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
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Beartrap corundum deposit, Madison County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:784503
Long-form Identifier:1:3:784503:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
15.6km (9.7 miles) ⓘGallatin Corundum deposit, Gallatin Gateway, Gallatin County, Montana, USA
16.6km (10.3 miles) ⓘElk Creek corundum deposit (Montana Mine; Gallatin deposit; Flying D), Gallatin County, Montana, USA
22.8km (14.2 miles) ⓘBozeman Corundum Mine, Gallatin Gateway, Gallatin County, Montana, USA
23.4km (14.5 miles) ⓘAlbitite, West Gallatin Mining District, Gallatin County, Montana, USA
30.6km (19.0 miles) ⓘMica Creek Deposit (Mica Mine), Gallatin Range, Gallatin County, Montana, USA
37.9km (23.5 miles) ⓘSkunk Creek outcrops, Madison County, Montana, USA
39.3km (24.4 miles) ⓘGilliam prospect, Madison County, Montana, USA
57.4km (35.6 miles) ⓘGolden Sunlight Mine, Whitehall Mining District (Cardwell Mining District), Jefferson County, Montana, USA
74.7km (46.4 miles) ⓘPohndorf Mine, Toll Mountain, Boulder Batholith, Jefferson County, Montana, USA
83.4km (51.8 miles) ⓘDillon Nickel Deposit (Wolf Creek Nickel Deposit), Ruby Mining District, Beaverhead 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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