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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Sepiolite from
Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA


Locality type:Quarry
Classification
Species:Sepiolite
Formula:Mg4(Si6O15)(OH)2 · 6H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sepiolite data
Locality Data:Click here to view Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA
Data Identifiers
Mindat Occurrence Record ID:138113
Long-form Identifier:1:3:138113:9
GUID (UUID V4):0
References
Cooper, Joseph F., Dunning, Gail E. (1986) Mineralogy of the Kalkar Quarry, Santa Cruz, California. The Mineralogical Record, 17 (5) 315-326
 
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