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-Ca from
Yugawara Hot Spring, Yugawara, Ashigarashimo District, Kanagawa Prefecture, Japan


Locality type:Hot Springs
Classification
Species:Heulandite-Ca
Formula:(Ca,Na)5(Si27Al9)O72 · 26H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite-Ca data
Locality Data:Click here to view Yugawara Hot Spring, Yugawara, Ashigarashimo District, Kanagawa Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:522113
Long-form Identifier:1:3:522113:4
GUID (UUID V4):0
References
Harada et al (1969) Chishitsugaku Zasshi, 75, 551-552.
 
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