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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Chrome-Kaolinite from
Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA


02383560017367322313780.jpg
Chrome-Kaolinite

Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
07381180017272302134587.jpg
Chrome-Kaolinite

Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
04981700017367323149572.jpg
Chrome-Kaolinite

Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
Classification
Species:Kaolinite var: Chrome-Kaolinite
Formula:(Al,Cr)2(Si2O5)(OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chrome-Kaolinite data
Locality Data:Click here to view Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
Data Identifiers
Mindat Occurrence Record ID:668564
Long-form Identifier:1:3:668564:5
GUID (UUID V4):0
References
Vonsen, Magnus (1946), Minerals at “The Geysers,” Sonoma County, California: California Division Mines Report 42: 248
Brookins, D. G. (1973) Chemical and X-Ray investigation of chromiferous kaolinite (“miloschite”) from the Geysers, Sonoma County, California. Clays and Clay Minerals, 21 (5) 421-422 doi:10.1346/ccmn.1973.0210518
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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