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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Erythrite from
Berryessa Valley, Napa County, California, USA


Locality type:Valley
Classification
Species:Erythrite
Formula:Co3(AsO4)2 · 8H2O
Comments:Occurs in thin seams.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Chlorite Group
Serpentine Subgroup
Data
Mineral Data:Click here to view Erythrite data
Locality Data:Click here to view Berryessa Valley, Napa County, California, USA
Data Identifiers
Mindat Occurrence Record ID:649157
Long-form Identifier:1:3:649157:4
GUID (UUID V4):0
References
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 179, 340
 
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