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
Rompas, Ylitornio, Lapland, Finland


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 Rompas, Ylitornio, Lapland, Finland
Data Identifiers
Mindat Occurrence Record ID:884587
Long-form Identifier:1:3:884587:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
27.4km (17.0 miles) ⓘVinsa, Rovaniemi, Lapland, Finland
27.8km (17.3 miles) ⓘKivimaa, Tervola, Lapland, Finland
30.0km (18.6 miles) ⓘPukinselkä, Tervola, Lapland, Finland
31.8km (19.8 miles) ⓘKivilompolo, Ylitornio, Lapland, Finland
34.8km (21.6 miles) ⓘPetäjävaara (Rosvohotu), Rovaniemi, Lapland, Finland
66.4km (41.3 miles) ⓘKilvenjärvi Offset Sulfide-PGE Deposit, Portimo complex, Lapland, Finland
96.2km (59.8 miles) ⓘKylmäkangas, Kuivaniemi, Ii, North Ostrobothnia, Finland
97.0km (60.3 miles) ⓘSääskilampi, Ranua, Lapland, Finland
97.8km (60.8 miles) ⓘKompsa, Kuivaniemi, Ii, North Ostrobothnia, Finland
98.6km (61.3 miles) ⓘKarahkalehto (Karahka), Kuivaniemi, Ii, North Ostrobothnia, Finland
References
Vanhanen, E. 2013. Rompaksen kultatutkimusprojekti. Kaivosseminaari, Levi 6.6.2013.
Molnár, Ferenc, Hugh O’Brien, Holly Stein, and Nick D. J. Cook. (2017) "Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane" Minerals 7, no. 9: 171. https://doi.org/10.3390/min7090171
 
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