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
Hella 2 Feldspar Quarry, Helle, Stokken, Arendal, Agder, Norway


Locality type:Quarry
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 Hella 2 Feldspar Quarry, Helle, Stokken, Arendal, Agder, Norway
Data Identifiers
Mindat Occurrence Record ID:682899
Long-form Identifier:1:3:682899:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.1km (0.0 miles) ⓘHella 1 Feldspar Quarry, Helle, Stokken, Arendal, Agder, Norway
0.9km (0.6 miles) ⓘMørefjær Feldspar Quarry (Mörefjer), Stokken, Arendal, Agder, Norway
1.0km (0.7 miles) ⓘAlviken Feldspar Quarry, Stokken, Arendal, Agder, Norway
2.0km (1.2 miles) ⓘHamnevollneset, Stokken, Arendal, Agder, Norway
2.4km (1.5 miles) ⓘGarta Feldspar Quarry, Stokken, Arendal, Agder, Norway
5.3km (3.3 miles) ⓘNarestø Feldspar Quarry, Flosta, Arendal, Agder, Norway
8.3km (5.2 miles) ⓘÅrgruven Iron Mine, Lyngrott Mining Field, Lyngrott, Froland, Agder, Norway
8.4km (5.2 miles) ⓘGloserheia, Froland, Agder, Norway
8.7km (5.4 miles) ⓘSeljeåsen Quartz Prospect, Seljåsen, Lyngrott, Froland, Agder, Norway
9.1km (5.7 miles) ⓘFjeld Quarry (Fjellvand Quarry), Austre Moland, Arendal, Agder, Norway
References
Andersen, Olaf (1931) Feltspat II. Forekomster i fylkene Buskerud og Telemark, i flere herreder i Aust-Agder og i Hidra i Vest-Agder [Feldspar II. Occurrences in the counties of Buskerud and Telemark, in several counties in Aust-Agder and in Hidra in Vest-Agder], in Feltspat II. Feltspat III. Norges Geologiske Undersøkelse 128b, 1-109
 
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