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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Quartz from
Repanga Island (Cuvier Island), Thames-Coromandel District, Waikato Region, New Zealand


Locality type:Island
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Repanga Island (Cuvier Island), Thames-Coromandel District, Waikato Region, New Zealand
Data Identifiers
Mindat Occurrence Record ID:204276
Long-form Identifier:1:3:204276:3
GUID (UUID V4):0
References
Black, Philippa M. (1970) Grandidierite from Cuvier Island, New Zealand. Mineralogical Magazine, 37 (289) 615-617 doi:10.1180/minmag.1970.037.289.12
Grice, Joel D., Robinson, George W. (1989) Feruvite, a new member of the tourmaline group, and its crystal structure. The Canadian Mineralogist, 27 (2) 199-203
 
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