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
Åkerberg mine, Skellefteå, Västerbotten County, Sweden


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 Åkerberg mine, Skellefteå, Västerbotten County, Sweden
Data Identifiers
Mindat Occurrence Record ID:892473
Long-form Identifier:1:3:892473:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
13.1km (8.2 miles) ⓘBjörkdal Mine, Sandfors, Skellefteå, Västerbotten County, Sweden
13.9km (8.6 miles) ⓘHebbersfors (Häbbersfors), Sandfors, Skellefteå, Västerbotten County, Sweden
22.8km (14.2 miles) ⓘÅkulla Au-Te deposit, Boliden, Skellefteå, Västerbotten County, Sweden
26.1km (16.2 miles) ⓘBoliden Mine, Boliden, Skellefteå, Västerbotten County, Sweden
26.8km (16.7 miles) ⓘVaruträsk, Skellefteå, Västerbotten County, Sweden
27.4km (17.0 miles) ⓘYtterbodliden, Skellefteå, Västerbotten County, Sweden
31.3km (19.4 miles) ⓘBergskär, Skellefteå, Västerbotten County, Sweden
33.7km (21.0 miles) ⓘPetiknäs mine, Boliden, Skellefteå, Västerbotten County, Sweden
38.8km (24.1 miles) ⓘÄlgliden dyke, Skellefteå, Västerbotten County, Sweden
61.6km (38.3 miles) ⓘKluntarna, Piteå, Norrbotten County, Sweden
References
Billström, Kjell, Mattson, Benny, Söderlund, Ulf, Årebäck, Hans, Broman, Curt (2012) Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden. Minerals, 2 (4) 385-416 doi:10.3390/min2040385
Lynch, Edward P.; Szentpéteri, Krisztián; Andersson, Joel B.H.; Kuusela, Janne; Sadeghi, Martiya; Bauer, Tobias E. (2025) Lithium-caesium-tantalum (LCT) pegmatite mineralization in the Paleoproterozoic central Fennoscandian Shield (Sweden and Finland): A review of geological characteristics and assessment of mineral system commonalities. Ore Geology Reviews, 184. 106739 doi:10.1016/j.oregeorev.2025.106739
 
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