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


Classification
Species:Anorthite
Formula:Ca(Al2Si2O8)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Anorthite data
Locality Data:Click here to view San Martino al Cimino, Viterbo, Viterbo Province, Lazio, Italy
Data Identifiers
Mindat Occurrence Record ID:942010
Long-form Identifier:1:3:942010:6
GUID (UUID V4):0
Nearest other occurrences of Anorthite
3.1km (1.9 miles) ⓘLe Carcarelle, Viterbo, Viterbo Province, Lazio, Italy
5.3km (3.3 miles) ⓘTre Croci, Vetralla, Viterbo Province, Lazio, Italy
33.7km (21.0 miles) ⓘFicoreto carbonatite, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy
35.0km (21.8 miles) ⓘMonte Tozzo, Campagnano di Roma, 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
36.9km (22.9 miles) ⓘBiachella Valley, Sacrofano, Metropolitan City of Rome Capital, Lazio, Italy
38.3km (23.8 miles) ⓘPoggio Pinzo (Gradoli pozzolana quarry), Gradoli, Viterbo Province, Lazio, Italy
39.2km (24.3 miles) ⓘMontenero Quarry, Onano, Viterbo Province, Lazio, Italy
44.4km (27.6 miles) ⓘCase Collina, Pitigliano, Grosseto Province, Tuscany, Italy
References
Zambonini F. (1900): Anortite di S. Martino (Viterbo). Riv. Miner. e Crist. Ital., 24, 4-13
Stoppani, F.S., Curti, E. (1982): I minerali del Lazio. Editoriale Olimpia, Firenze, 291 pp.
 
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