Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Muscovite from
Hunnakko, Alavus, South 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 Hunnakko, Alavus, South Ostrobothnia, Finland
Data Identifiers
Mindat Occurrence Record ID:640682
Long-form Identifier:1:3:640682:0
GUID (UUID V4):0
Nearest other occurrences of Muscovite
5.3km (3.3 miles) ⓘKaatiala pegmatite, Kuortane, South Ostrobothnia, Finland
12.3km (7.7 miles) ⓘTarinkorpi, Seinäjoki, South Ostrobothnia, Finland
12.5km (7.8 miles) ⓘTarikko, Seinäjoki, South Ostrobothnia, Finland
13.2km (8.2 miles) ⓘHaapaluoma pegmatite, Peräseinäjoki, Seinäjoki, South Ostrobothnia, Finland
23.2km (14.4 miles) ⓘKalliosalo, Seinäjoki, South Ostrobothnia, Finland
24.0km (14.9 miles) ⓘTervasmäki S, Seinäjoki, South Ostrobothnia, Finland
25.3km (15.7 miles) ⓘP-K pegmatite, Seinäjoki, South Ostrobothnia, Finland
26.2km (16.3 miles) ⓘPajuluoma, Seinäjoki, South Ostrobothnia, Finland
26.2km (16.3 miles) ⓘPerälänjuoni, Pajuluoma, Seinäjoki, South Ostrobothnia, Finland
27.0km (16.8 miles) ⓘPuolivälinkalliot pegmatite, Seinäjoki, South Ostrobothnia, Finland
References
Haapala, Ilmari (1966) On the granitic pegmatites in the Peräseinäjoki-Alavus area, South Pohjanmaa, Finland. Bulletin de la Commission Géologique de Finlande Vol. 224. Geological Survey of Finland
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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