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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Muscovite from
Syväjärv, Kaustinen, Central Ostrobothnia, Finland


Locality type:Pegmatite
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Syväjärv, Kaustinen, Central Ostrobothnia, Finland
Data Identifiers
Mindat Occurrence Record ID:889159
Long-form Identifier:1:3:889159:4
GUID (UUID V4):0
Nearest other occurrences of Muscovite
0.0km (0.0 miles) ⓘSyväjärvi, Seinäjoki, South Ostrobothnia, Finland
2.0km (1.3 miles) ⓘTuoreetsaaret, Kaustinen, Central Ostrobothnia, Finland
2.5km (1.5 miles) ⓘEmmes, Kaustinen, Central Ostrobothnia, Finland
3.1km (1.9 miles) ⓘRapasaaret, Kaustinen, Central Ostrobothnia, Finland
3.3km (2.0 miles) ⓘOutovesi, Kaustinen, Central Ostrobothnia, Finland
4.1km (2.5 miles) ⓘPäiväneva, Kaustinen, Central Ostrobothnia, Finland
4.5km (2.8 miles) ⓘHeikinkangas, Kaustinen, Central Ostrobothnia, Finland
5.5km (3.4 miles) ⓘLeviäkangas, Kaustinen, Central Ostrobothnia, Finland
11.7km (7.2 miles) ⓘJänislampi, Ostrobothnia, Finland
11.7km (7.3 miles) ⓘMatoneva, Kaustinen, Central Ostrobothnia, Finland
References
Geologian tutkimuskeskus, Tutkimusraportti 198 – Geological Survey of Finland, Report of Investigation 198, 2013 Pentti Hölttä (ed.)
Lynch, Edward P.; Szentpéteri, Krisztián; Andersson, Joel B.H.; Kuusela, Janne; Sadeghi, Martiya; Bauer, Tobias E. (2025) Lithium-caesium-tantalum (LCT) pegmatite mineralization in the Paleoproterozoic central Fennoscandian Shield (Sweden and Finland): A review of geological characteristics and assessment of mineral system commonalities. Ore Geology Reviews, 184. 106739 doi:10.1016/j.oregeorev.2025.106739
 
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