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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Jacobsite from
Kunimiyama mine, Kochi City, Kochi Prefecture, Japan


Locality type:Mine
Classification
Species:Jacobsite
Formula:Mn2+Fe23+O4
Comments:(Not mentioned in the reference, but seems probable from the "magnetite" compositions given.)
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Jacobsite data
Locality Data:Click here to view Kunimiyama mine, Kochi City, Kochi Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:414708
Long-form Identifier:1:3:414708:4
GUID (UUID V4):0
References
Takabatake, A. (1956) Symposium sobre yacimientos de manganeso. Vol. 4, 207ff (Mexico, 1956)
 
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