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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Stilpnomelane from
Martegn - Muttala Sura, Innerferrera (Calantgil), Ferrera, Viamala Region, Grisons, Switzerland


Locality type:Vein
Classification
Species:Stilpnomelane
Formula:K4Fe482+[Si64Al8]O164(OH)52 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilpnomelane data
Locality Data:Click here to view Martegn - Muttala Sura, Innerferrera (Calantgil), Ferrera, Viamala Region, Grisons, Switzerland
Data Identifiers
Mindat Occurrence Record ID:821992
Long-form Identifier:1:3:821992:3
GUID (UUID V4):0
Nearest other occurrences of Stilpnomelane
22.2km (13.8 miles) ⓘPiz dal Sasc, Casaccia, Upper Val Bregaglia, Bregaglia, Maloja Region, Grisons, Switzerland
22.7km (14.1 miles) ⓘPiz Lunghin, Casaccia, Upper Val Bregaglia, Bregaglia, Maloja Region, Grisons, Switzerland
35.8km (22.2 miles) ⓘGneiss quarries, Arvigo, Calanca, Moesa Region, Grisons, Switzerland
58.6km (36.4 miles) ⓘGonzen Mine, Sargans, Sarganserland, St. Gallen, Switzerland
99.9km (62.0 miles) ⓘSeula mine, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
References
Brugger J. (1996): The Fe, Mn, (V, Sb, As, Be, W) deposits of Val Ferrera (Graubünden, Switzerland). Unpublished PhD Thesis, Univ. Basel. 188 p.
 
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