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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Gypsum from
Sulphur Bank Mine (Sulfur Bank Mine; Sulphur Bank deposits), Clear Lake Oaks, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Lake County, California, USA


Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Comments:Abundant as efflorescences.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Sulphur Bank Mine (Sulfur Bank Mine; Sulphur Bank deposits), Clear Lake Oaks, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Lake County, California, USA
Data Identifiers
Mindat Occurrence Record ID:144802
Long-form Identifier:1:3:144802:3
GUID (UUID V4):0
Nearest other occurrences of Gypsum
25.4km (15.8 miles) ⓘThe Geysers, West Mayacmas Mining District, Sonoma County, California, USA
44.0km (27.3 miles) ⓘCalistoga Mine (Silverado Mine; Palisade Mine; Palisades Mine; Grigsby Mine), The Palisades [range], Calistoga, Napa County, California, USA
References
 
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