The Geysers geothermal area consists of a series of steam vents along Geyser Creek Canyon where high sulfuric acid waters have deposited a variety of sulfate minerals. The area is now not active and minerals are not being formed.
References:
Dunning, G. S. & Cooper, J. F. (1993): History and minerals of The Geysers Sonoma County, California. Mineralogical Record 24 (5): 339-352
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Map Reference: 38°48'7"N , 122°48'11"W
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Mineral List:29 entries listed. 28 valid minerals. 1 type locality (valid mineral).
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