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
Midtbø (Midbø), Tvedestrand, Agder, Norway


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 Midtbø (Midbø), Tvedestrand, Agder, Norway
Data Identifiers
Mindat Occurrence Record ID:912723
Long-form Identifier:1:3:912723:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.3km (1.4 miles) ⓘSolbutjernane, Tvedestrand, Agder, Norway
4.7km (2.9 miles) ⓘHauglandsvatnet, Vegårshei, Agder, Norway
5.1km (3.2 miles) ⓘNordre Fiane Iron Mine, Solberg iron mines, Holt, Tvedestrand, Agder, Norway
5.8km (3.6 miles) ⓘGangdalstjern mine, Solberg iron mines, Holt, Tvedestrand, Agder, Norway
6.0km (3.8 miles) ⓘØsterådalen, Østerå, Tvedestrand, Agder, Norway
6.9km (4.3 miles) ⓘJensen's Feldspar Quarry, Holt, Tvedestrand, Agder, Norway
9.5km (5.9 miles) ⓘVåland Mine, Holt, Tvedestrand, Agder, Norway
10.0km (6.2 miles) ⓘFjeld Quarry (Fjellvand Quarry), Austre Moland, Arendal, Agder, Norway
10.1km (6.2 miles) ⓘSkuggestøl Pegmatite, Risør, Agder, Norway
10.1km (6.3 miles) ⓘGrasås Feldspar Quarry, Austre Moland, Arendal, Agder, Norway
References
Mallard, Ernest (1887) Sur la Cryptolite de Norvège [monazite]. Bulletin de Minéralogie, 10 (7) 236-238 doi:10.3406/bulmi.1887.2070
 
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