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
San Martino al Cimino, Viterbo, Viterbo Province, Lazio, Italy


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 San Martino al Cimino, Viterbo, Viterbo Province, Lazio, Italy
Data Identifiers
Mindat Occurrence Record ID:942020
Long-form Identifier:1:3:942020:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.1km (1.9 miles) ⓘLe Carcarelle, Viterbo, Viterbo Province, Lazio, Italy
5.3km (3.3 miles) ⓘTre Croci, Vetralla, Viterbo Province, Lazio, Italy
23.3km (14.5 miles) ⓘSH2 deep well, Bracciano, Metropolitan City of Rome Capital, Lazio, Italy
28.1km (17.4 miles) ⓘTrachyte quarry, Ponzano, Bagnoregio, Viterbo Province, Lazio, Italy
29.1km (18.1 miles) ⓘMonte Rovello, Allumiere, Metropolitan City of Rome Capital, Lazio, Italy
32.2km (20.0 miles) ⓘSpizzicatore Hill, Allumiere, Metropolitan City of Rome Capital, Lazio, Italy
32.7km (20.3 miles) ⓘPianciano, Castel Giuliano, Bracciano, Metropolitan City of Rome Capital, Lazio, Italy
33.8km (21.0 miles) ⓘLa Mola, Anguillara Sabazia, Metropolitan City of Rome Capital, Lazio, Italy
35.4km (22.0 miles) ⓘMonte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
35.8km (22.2 miles) ⓘFosso Attici, Magliano Romano, Metropolitan City of Rome Capital, Lazio, Italy
References
Stoppani, F.S., Curti, E. (1982): I minerali del Lazio. Editoriale Olimpia, Firenze, 291 pp.
 
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