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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Cryptomelane from
Ani Mine, Ani-machi, Kitaakita City, Akita Prefecture, Japan


Locality type:Mine
Classification
Species:Cryptomelane
Formula:K(Mn74+Mn3+)O16
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Cryptomelane data
Locality Data:Click here to view Ani Mine, Ani-machi, Kitaakita City, Akita Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:643626
Long-form Identifier:1:3:643626:1
GUID (UUID V4):0
References
(n.d.) Dr. Matsuo Nambu collection, Geological Survey of Japan.
 
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