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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Letovicite from
The Geysers, West Mayacmas Mining District, Sonoma County, California, USA


03034600017362362484387.jpg
Letovicite

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
07768750017272011548918.jpg
Letovicite, etc.

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
03034600017362362484387.jpg
Letovicite

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
06185320017272011324278.jpg
Letovicite, etc.

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
03034600017362362484387.jpg
Letovicite

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
06185320017272011324278.jpg
Letovicite, etc.

The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
Locality type:Geothermal Field
Classification
Species:Letovicite
Formula:(NH4)3H(SO4)2
Comments:Occurs as platy micro-crystals on massive mascagnite from Boric Acid Springs along Geyser Creek Canyon.
Habit:masses of pseudohexagonal crystals 0.03 by 0.05 mm and 0.0005mm thick
Colour:Colourless
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Mascagnite
Associated Minerals Based on Photo Data:
Mascagnite1
Data
Mineral Data:Click here to view Letovicite data
Locality Data:Click here to view The Geysers, West Mayacmas Mining District, Sonoma County, California, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:6923
Long-form Identifier:1:3:6923:6
GUID (UUID V4):0
References
Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 246, 279
Vonsen, Magnus (1946), Minerals at “The Geysers,” Sonoma County, California: California Division Mines Report 42: 288
Dunning, Gail E. and J.F. Cooper (1969a) Letovicite from The Geysers, Sonoma County, California. California Division Mines and Geology Mineral Information Service: 22: 135
Cooper, Joseph F., Dunning, Gail E. (1993) History and Minerals of The Geysers, Sonoma County, California. The Mineralogical Record, 24 (5) 339-354
 
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