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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Pleonaste from
Unnamed Spinel occurrence [1], Butte Valley (Hidden Valley), Panamint Range (Panamint Mountains), Inyo County, California, USA


Locality type:Outcrop
Classification
Species:Spinel var: Pleonaste
Formula:(Mg,Fe)Al2O4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pleonaste data
Locality Data:Click here to view Unnamed Spinel occurrence [1], Butte Valley (Hidden Valley), Panamint Range (Panamint Mountains), Inyo County, California, USA
Data Identifiers
Mindat Occurrence Record ID:651256
Long-form Identifier:1:3:651256:9
GUID (UUID V4):0
References
McAllister, James F. (1955) Geology of mineral deposits, Ubehebe Peak quadrangle, Inyo County, California. Special Report 42. California Division of Mines p.61
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 345
 
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