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
Mont'Orfano (Montorfano), Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, 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
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Mont'Orfano (Montorfano), Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
Data Identifiers
Mindat Occurrence Record ID:953443
Long-form Identifier:1:3:953443:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.8km (1.7 miles) ⓘCirla Quarry (Monte Camoscio Quarry; Camoscio Quarry), Feriolo, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
3.1km (1.9 miles) ⓘMount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
4.6km (2.9 miles) ⓘCandoglia, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
4.9km (3.0 miles) ⓘOrnavasso pegmatite, Ornavasso, Verbano-Cusio-Ossola Province, Piedmont, Italy
7.7km (4.8 miles) ⓘSan Pietro Quarry (San Pietro Oratory), Nibbio, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
8.1km (5.0 miles) ⓘMigiandone Mine (Miggiandone), Ornavasso, Verbano-Cusio-Ossola Province, Piedmont, Italy
8.2km (5.1 miles) ⓘNibbio-Val Faera (Nibbio-Val Fredda) pegmatites, Nibbio, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
8.5km (5.3 miles) ⓘAlpe Agricola gneiss outcrop, Caprezzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
8.8km (5.5 miles) ⓘCuzzago-Proman pegmatite veins, Premosello-Chiovenda, Verbano-Cusio-Ossola Province, Piedmont, Italy
9.0km (5.6 miles) ⓘMonte Eyehorn pegmatites (Monte Ehie Horn pegmatites), Valstrona, Verbano-Cusio-Ossola Province, Piedmont, Italy
References
Scaini G. (1939): Itinerari mineralogici. Comune di Mergozzo. Località: cave di granito bianco di Mont’Orfano. Natura, 30, 3, 155-159
Del Caldo, A.; Moro, C.; Gramaccioli, C.M.; Boscardin, M. (1973) Guida ai minerali. Fratelli Fabbri Editori. 208 pp.
De Michele, V. (1974) Guida mineralogica d'Italia. Istituto Geografico De Agostini.
Boriani A., Burlini L., Caironi V., Giobbi Origoni E., Sassi A., Sesana E. (1988): Geological and petrological studies on the hercynian plutonism of Serie dei Laghi - geological map of its occurrence between Valsesia and Lago Maggiore (N-Italy). Rend. Soc. Ital. Miner. Petrol., 43, 2, 367-384
 
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