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
Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy


02271570017368219496969.jpg
Biotite

Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
02271570017368219496969.jpg
Biotite

Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
09496660017272724799733.jpg
Biotite

Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
Locality type:Mountain
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:
Sanidine3
Hellandite Group2
Pyrochlore Group1
Nepheline1
Titanite1
Zircon1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:417236
Long-form Identifier:1:3:417236:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.5km (0.9 miles) ⓘBiachella Valley, Sacrofano, Metropolitan City of Rome Capital, Lazio, Italy
1.6km (1.0 miles) ⓘFosso Attici, Magliano Romano, Metropolitan City of Rome Capital, Lazio, Italy
1.7km (1.0 miles) ⓘLapilli quarry, Magliano Romano, Metropolitan City of Rome Capital, Lazio, Italy
12.1km (7.5 miles) ⓘLa Mola, Anguillara Sabazia, Metropolitan City of Rome Capital, Lazio, Italy
17.1km (10.6 miles) ⓘSH2 deep well, Bracciano, Metropolitan City of Rome Capital, Lazio, Italy
23.3km (14.5 miles) ⓘPianciano, Castel Giuliano, Bracciano, Metropolitan City of Rome Capital, Lazio, Italy
33.3km (20.7 miles) ⓘCapo di Bove, Rome, Metropolitan City of Rome Capital, Lazio, Italy
35.1km (21.8 miles) ⓘTre Croci, Vetralla, Viterbo Province, Lazio, Italy
35.5km (22.1 miles) ⓘLe Carcarelle, Viterbo, Viterbo Province, Lazio, Italy
35.9km (22.3 miles) ⓘSan Martino al Cimino, Viterbo, Viterbo Province, Lazio, Italy
References
Mattei, Luigi, Curti, Ezio, Bellatreccia, Fabio (2009) Primo ritrovamento di "gadolinite" nella caldera di Sacrofano. Il Cercapietre: 1-2: 67-68.
 
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