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
Nautanen Mine, Nautanen, Gällivare, Norrbotten County, Sweden


Locality type: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 Nautanen Mine, Nautanen, Gällivare, Norrbotten County, Sweden
Data Identifiers
Mindat Occurrence Record ID:1822343
Long-form Identifier:1:3:1822343:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.6km (0.4 miles) ⓘNautanen North deposit, Nautanen, Gällivare, Norrbotten County, Sweden
10.0km (6.2 miles) ⓘMalmberget, Gällivare, Norrbotten County, Sweden
10.0km (6.2 miles) ⓘKung Oskar mine, Malmberget, Gällivare, Norrbotten County, Sweden
13.3km (8.3 miles) ⓘAitik Mine, Gällivare, Norrbotten County, Sweden
13.9km (8.6 miles) ⓘLiikavaara East, Gällivare, Norrbotten County, Sweden
15.6km (9.7 miles) ⓘSalmijärvi, Gällivare, Norrbotten County, Sweden
36.4km (22.6 miles) ⓘNunasvaara, Vittangi, Kiruna, Norrbotten County, Sweden
49.6km (30.8 miles) ⓘPainirova, Kiruna, Norrbotten County, Sweden
49.8km (30.9 miles) ⓘLeveäniemi Mine, Svappavaara, Kiruna, Norrbotten County, Sweden
66.4km (41.3 miles) ⓘPattok, Gällivare, Norrbotten County, Sweden
References
Bauer, Tobias E., Lynch, Edward P., Sarlus, Zmar, Drejing-Carroll, David, Martinsson, Olof, Metzger, Nicolai, Wanhainen, Christina (2022) Structural Controls on Iron Oxide Copper-Gold Mineralization and Related Alteration in a Paleoproterozoic Supracrustal Belt: Insights from the Nautanen Deformation Zone and Surroundings, Northern Sweden. Economic Geology, 117 (2) 327-359 doi:10.5382/econgeo.4862
 
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