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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Biotite from
Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland


Locality type:Pegmatite
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
Associated Minerals Based on Photo Data:
Triplite1
Alluaudite1
Quartz1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
Data Identifiers
Mindat Occurrence Record ID:98765
Long-form Identifier:1:3:98765:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
8.6km (5.4 miles) ⓘKatila, Eräjärvi area, Orivesi, Pirkanmaa, Finland
11.9km (7.4 miles) ⓘEräpyhä pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland
49.7km (30.9 miles) ⓘKaapelinkulma, Valkeakoski, Pirkanmaa, Finland
55.3km (34.4 miles) ⓘNiemikylä granite quarries, Kuru, Ylöjärvi, Pirkanmaa, Finland
59.6km (37.0 miles) ⓘVatanen, Pirkkala, Pirkanmaa, Finland
74.0km (46.0 miles) ⓘNappikallio, Kalvola, Hämeenlinna, Kanta-Häme, Finland
76.4km (47.5 miles) ⓘHaveri mine, Viljakkala, Ylöjärvi, Pirkanmaa, Finland
93.9km (58.3 miles) ⓘRakokivenmäki pegmatite, Heinola, Päijänne Tavastia, Finland
97.6km (60.6 miles) ⓘKuusisuo, Heinola, Päijänne Tavastia, Finland
References
Sandström, Frej, Lahti, Seppo I. (2009) Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litofilen. Medlemsblad för Västerås AmatörGeologiska Sällskap, 26 (1) 11-38
 
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