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
Unnamed Mn occurrence, San Onofre Mountain Summit area, San Onofre Mountain, Marine Corps Base Camp Pendleton, San Diego County, California, USA


Locality type:Occurrence
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Tephroite
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Unnamed Mn occurrence, San Onofre Mountain Summit area, San Onofre Mountain, Marine Corps Base Camp Pendleton, San Diego County, California, USA
Data Identifiers
Mindat Occurrence Record ID:677386
Long-form Identifier:1:3:677386:1
GUID (UUID V4):0
References
its nature and origin: University of California, Department of Geological Sciences Bulletin 15: 194
Woodford, A.O. (1925), The San Onofre breccia
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 361
 
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