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
Cala Moresca, Monte Argentario, Grosseto Province, Tuscany, 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 Cala Moresca, Monte Argentario, Grosseto Province, Tuscany, Italy
Data Identifiers
Mindat Occurrence Record ID:941663
Long-form Identifier:1:3:941663:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.6km (1.0 miles) ⓘCala Grande, Monte Argentario, Grosseto Province, Tuscany, Italy
15.9km (9.9 miles) ⓘArenella (Cava del Piccione), Giglio Island, Isola del Giglio, Grosseto Province, Tuscany, Italy
57.8km (35.9 miles) ⓘCase Collina, Pitigliano, Grosseto Province, Tuscany, Italy
58.1km (36.1 miles) ⓘGavorrano Mine, Gavorrano, Grosseto Province, Tuscany, Italy
64.8km (40.3 miles) ⓘMontenero Quarry, Onano, Viterbo Province, Lazio, Italy
65.3km (40.6 miles) ⓘPoggio Pinzo (Gradoli pozzolana quarry), Gradoli, Viterbo Province, Lazio, Italy
67.5km (41.9 miles) ⓘRhyolite dome, Roccatederighi, Roccastrada, Grosseto Province, Tuscany, Italy
67.5km (42.0 miles) ⓘSpizzicatore Hill, Allumiere, Metropolitan City of Rome Capital, Lazio, Italy
67.9km (42.2 miles) ⓘTerranera Mine, Porto Azzurro, Livorno Province, Tuscany, Italy
69.9km (43.4 miles) ⓘTorre di Rio - Santa Filomena area (Monte della Torre), Rio Marina, Rio, Livorno Province, Tuscany, Italy
References
Elter M.F, Pandeli E. (2001): 3 - Southern Tuscany - A - Argentario Promontory. Ofioliti, 26, 2a, 357-360
 
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