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
Oswaldiberg tunnel (A10 Highway tunnel), Oswaldiberg, Villach, Carinthia, Austria


Locality type:Tunnel
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 Oswaldiberg tunnel (A10 Highway tunnel), Oswaldiberg, Villach, Carinthia, Austria
Data Identifiers
Mindat Occurrence Record ID:910342
Long-form Identifier:1:3:910342:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.8km (2.4 miles) ⓘMarble quarry, Gummern, Weißenstein, Villach-Land District, Carinthia, Austria
4.0km (2.5 miles) ⓘModre quarry, Kras, Treffen am Ossiacher See, Villach-Land District, Carinthia, Austria
4.9km (3.1 miles) ⓘJungfernsprung, Landskron castle, Landskron, Villach, Carinthia, Austria
23.2km (14.4 miles) ⓘGarnet Mine, Lucknergraben, Radenthein, Spittal an der Drau District, Carinthia, Austria
27.3km (17.0 miles) ⓘMagnesite Mine, Millstätter Alpe, Millstatt, Spittal an der Drau District, Carinthia, Austria
36.3km (22.6 miles) ⓘA10 Highway cut, Eisentratten, Krems in Kärnten, Spittal an der Drau District, Carinthia, Austria
47.6km (29.6 miles) ⓘSilver mines (incl. Altenberg District; Dürrenrain District; Haderbau), Ramingstein, Tamsweg District, Salzburg, Austria
49.2km (30.5 miles) ⓘPreisdorfer Wald deposit, Kolbnitz, Reißeck, Spittal an der Drau District, Carinthia, Austria
50.8km (31.6 miles) ⓘGravel pit, Napplach, Kolbnitz, Reißeck, Spittal an der Drau District, Carinthia, Austria
52.9km (32.9 miles) ⓘSerpentinite quarry, Griesserhof (Gulitzen; Gullitzen), Hirt, Micheldorf, Sankt Veit an der Glan District, Carinthia, Austria
References
Hiden (1997)
 
and/or  
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