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
Biskupice Maars, Biskupice, Krnov, Bruntál District, Moravian-Silesian Region, Czech Republic


Locality type:Volcanic Center
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 Biskupice Maars, Biskupice, Krnov, Bruntál District, Moravian-Silesian Region, Czech Republic
Data Identifiers
Mindat Occurrence Record ID:1693174
Long-form Identifier:1:3:1693174:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
18.6km (11.5 miles) ⓘMelchior and Tobias adits, Dolní Údolí, Zlaté Hory, Jeseník District, Olomouc Region, Czech Republic
22.5km (14.0 miles) ⓘRight bank locality, Biała Głuchołaska river, Głuchołazy, Gmina Głuchołazy, Nysa County, Opole Voivodeship, Poland
23.0km (14.3 miles) ⓘOndřejovice iron mines, Ondřejovice, Zlaté Hory, Jeseník District, Olomouc Region, Czech Republic
25.9km (16.1 miles) ⓘUhlířský vrch, Bruntál, Bruntál District, Moravian-Silesian Region, Czech Republic
29.4km (18.2 miles) ⓘBukovice quarry, Bukovice, Jeseník, Jeseník District, Olomouc Region, Czech Republic
29.8km (18.5 miles) ⓘSławniowice, Gmina Głuchołazy, Nysa County, Opole Voivodeship, Poland
30.6km (19.0 miles) ⓘMnišské jámy, Loučná nad Desnou, Šumperk District, Olomouc Region, Czech Republic
30.9km (19.2 miles) ⓘBobrovník graphite deposit, Bělá pod Pradědem, Jeseník District, Olomouc Region, Czech Republic
31.8km (19.8 miles) ⓘKlen Hill, Česká Ves, Jeseník District, Olomouc Region, Czech Republic
31.9km (19.8 miles) ⓘKyzový důl (Schwarzenthal), Loučná nad Desnou, Šumperk District, Olomouc Region, Czech Republic
References
Kašing, Martin, Jirásek, Jakub, Matýsek, Dalibor, Valenta, Jan, Rapprich, Vladislav, Tábořík, Petr, Pek, Tomáš (2025) Almost eroded but still there: Oldest diatreme volcanoes of pre-Quaternary age in the eastern Bohemian Massif, Czechia. Geomorphology, 475. doi:10.1016/j.geomorph.2025.109668
 
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