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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Heulandite Subgroup from
Val di Crana, Toceno, Verbano-Cusio-Ossola Province, Piedmont, Italy


Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Val di Crana, Toceno, Verbano-Cusio-Ossola Province, Piedmont, Italy
Data Identifiers
Mindat Occurrence Record ID:925604
Long-form Identifier:1:3:925604:0
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
12.0km (7.5 miles) ⓘVergeletto Valley, Onsernone Valley, Centovalli, Locarno, Ticino, Switzerland
12.1km (7.5 miles) ⓘRencio quarries, Crodo gneiss quarries, Crodo, Verbano-Cusio-Ossola Province, Piedmont, Italy
15.7km (9.8 miles) ⓘRio Alfenza, Crodo, Verbano-Cusio-Ossola Province, Piedmont, Italy
18.7km (11.6 miles) ⓘPianasca Quarry, Villadossola, Verbano-Cusio-Ossola Province, Piedmont, Italy
20.0km (12.5 miles) ⓘMigiandone Mine (Miggiandone), Ornavasso, Verbano-Cusio-Ossola Province, Piedmont, Italy
20.4km (12.7 miles) ⓘGneiss quarries, Riveo, Maggia, Vallemaggia, Ticino, Switzerland
21.0km (13.1 miles) ⓘAusone quarry, Premia, Verbano-Cusio-Ossola Province, Piedmont, Italy
23.2km (14.4 miles) ⓘMont'Orfano (Montorfano), Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
25.2km (15.7 miles) ⓘScala dei Ratti Quarry (Ratti Quarry; Scala Quarry), Feriolo, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
26.0km (16.1 miles) ⓘSeula mine, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
References
Boscardin M., Mattioli V., Rocchetti I. (2013): Minerali della Valle Vigezzo. Litotipografia Alcione, Lavis (Trento), 229 pp.
 
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