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
Gloserheia, Froland, Agder, Norway


Locality type:Open-Cast 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 Gloserheia, Froland, Agder, Norway
Data Identifiers
Mindat Occurrence Record ID:365902
Long-form Identifier:1:3:365902:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.4km (0.2 miles) ⓘÅrgruven Iron Mine, Lyngrott Mining Field, Lyngrott, Froland, Agder, Norway
1.3km (0.8 miles) ⓘSeljeåsen Quartz Prospect, Seljåsen, Lyngrott, Froland, Agder, Norway
2.2km (1.4 miles) ⓘSeljeåsen Nickel Prospect, Lyngrott, Froland, Agder, Norway
4.2km (2.6 miles) ⓘKleggåsen Ruby Quarry, Froland, Agder, Norway
7.0km (4.3 miles) ⓘGrasås Feldspar Quarry, Austre Moland, Arendal, Agder, Norway
7.1km (4.4 miles) ⓘBliksåsen, Osedalen, Froland, Agder, Norway
7.4km (4.6 miles) ⓘFjeld Quarry (Fjellvand Quarry), Austre Moland, Arendal, Agder, Norway
8.4km (5.2 miles) ⓘHella 2 Feldspar Quarry, Helle, Stokken, Arendal, Agder, Norway
8.4km (5.2 miles) ⓘHella 1 Feldspar Quarry, Helle, Stokken, Arendal, Agder, Norway
8.4km (5.2 miles) ⓘVåland Mine, Holt, Tvedestrand, Agder, Norway
References
Åmli, Reidar (1975) Mineralogy and rare earth geochemistry of apatite and xenotime from the Gloserheia granite pegmatite, Froland, southern Norway. American Mineralogist, 60 (7-8). 607-620
Baadsgaard, H., Chaplin, C., & Griffin, W. L. (1984). Geochronology of the Gloserheia pegmatite, Froland, southern Norway. Norsk geologisk tidsskrift, 64 (2), 111-119.
 
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