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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Bertrandite from
Pianasca Quarry, Villadossola, Verbano-Cusio-Ossola Province, Piedmont, Italy


Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Pianasca Quarry, Villadossola, Verbano-Cusio-Ossola Province, Piedmont, Italy
Data Identifiers
Mindat Occurrence Record ID:83759
Long-form Identifier:1:3:83759:2
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
3.0km (1.9 miles) ⓘBeura quarries, Beura-Cardezza, Verbano-Cusio-Ossola Province, Piedmont, Italy
3.4km (2.1 miles) ⓘRastellina Quarry, Beura quarries, Beura-Cardezza, Verbano-Cusio-Ossola Province, Piedmont, Italy
6.9km (4.3 miles) ⓘGrignaschi Quarry, Cosasca, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
10.2km (6.4 miles) ⓘRio Margologio, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
11.4km (7.1 miles) ⓘPizzo Marcio South dyke, Pizzo Marcio, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
11.7km (7.3 miles) ⓘPizzo Marcio North dyke, Pizzo Marcio, Trontano, Verbano-Cusio-Ossola Province, Piedmont, Italy
11.9km (7.4 miles) ⓘCastelluccio Quarry, Montecrestese, Verbano-Cusio-Ossola Province, Piedmont, Italy
13.1km (8.1 miles) ⓘAlpe Campra (Campra), Antoliva Valley, Druogno, Verbano-Cusio-Ossola Province, Piedmont, Italy
13.8km (8.5 miles) ⓘPizzo Ragno (Northern slope), Alpe Campra (Campra), Antoliva Valley, Druogno, Verbano-Cusio-Ossola Province, Piedmont, Italy
14.4km (9.0 miles) ⓘAlpe Rosso, Orcesco, Druogno, Verbano-Cusio-Ossola Province, Piedmont, Italy
References
Rivista Mineralogica Italiana, 2 157-170.
 
and/or  
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