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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Maghemite from
Alameda County, California, USA


Locality type:County
Classification
Species:Maghemite
Formula:(Fe3+0.67◻0.33)Fe23+O4
Comments:Locality not specifically provided.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Maghemite data
Locality Data:Click here to view Alameda County, California, USA
Data Identifiers
Mindat Occurrence Record ID:647256
Long-form Identifier:1:3:647256:6
GUID (UUID V4):0
References
Newhouse, Walter Harry & J.P. Glass (1936), Some physical properties of certain iron oxides: Economic Geology: 31: 701
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 246.
 
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