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
Bergskär, Skellefteå, Västerbotten County, Sweden


Locality type:Islet
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 Bergskär, Skellefteå, Västerbotten County, Sweden
Data Identifiers
Mindat Occurrence Record ID:1664266
Long-form Identifier:1:3:1664266:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
17.2km (10.7 miles) ⓘYtterbodliden, Skellefteå, Västerbotten County, Sweden
17.8km (11.0 miles) ⓘVaruträsk, Skellefteå, Västerbotten County, Sweden
27.8km (17.2 miles) ⓘBjörkdal Mine, Sandfors, Skellefteå, Västerbotten County, Sweden
28.5km (17.7 miles) ⓘHebbersfors (Häbbersfors), Sandfors, Skellefteå, Västerbotten County, Sweden
31.3km (19.4 miles) ⓘÅkerberg mine, Skellefteå, Västerbotten County, Sweden
36.3km (22.5 miles) ⓘBoliden Mine, Boliden, Skellefteå, Västerbotten County, Sweden
45.5km (28.3 miles) ⓘÅkulla Au-Te deposit, Boliden, Skellefteå, Västerbotten County, Sweden
51.5km (32.0 miles) ⓘPetiknäs mine, Boliden, Skellefteå, Västerbotten County, Sweden
62.3km (38.7 miles) ⓘÄlgliden dyke, Skellefteå, Västerbotten County, Sweden
64.7km (40.2 miles) ⓘKluntarna, Piteå, Norrbotten County, Sweden
References
Welin, Eric (1965) Notes on the mineralogy of Sweden. 4. New discoveries of secondary uranium minerals. Arkiv för Mineralogi och Geologi, 4 (4, nr 3). 267-275
 
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