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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Alunite from
Unnamed Alunite occurrence [1], Hooker Canyon, Glen Ellen, Sonoma Mountains, Sonoma County, California, USA


Locality type:Occurrence
Classification
Species:Alunite
Formula:KAl3(SO4)2(OH)6
Comments:Occurs in a breccia & filling seams up to several feet wide.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Alunite data
Locality Data:Click here to view Unnamed Alunite occurrence [1], Hooker Canyon, Glen Ellen, Sonoma Mountains, Sonoma County, California, USA
Data Identifiers
Mindat Occurrence Record ID:673227
Long-form Identifier:1:3:673227:1
GUID (UUID V4):0
Nearest other occurrences of Alunite
53.8km (33.4 miles) ⓘThe Geysers, West Mayacmas Mining District, Sonoma County, California, USA
69.9km (43.4 miles) ⓘSulphur Bank Mine (Sulfur Bank Mine; Sulphur Bank deposits), Clear Lake Oaks, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Lake County, California, USA
72.0km (44.7 miles) ⓘSulphur Creek deposit, Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District), Coast Ranges, Colusa County, California, USA
References
San Francisco field district: California Journal of Mines and Geology, California Mining Bureau (Report 39): 39: 56
Laizure, Clyde McK (1943), Discoveries in the strategic minerals
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 62.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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