A geothermal/evaporite deposit located about 12 miles due E of Cloverdale.
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
Goldsmith, E. (1877), On boussingaultite and other minerals from Sonoma County, California: Academy of Natural Sciences of Philadelphia Proceedings: 28: 264-266.
Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp. (includes catalog of minerals of California pp. 63-410), and miscellaneous observations on mineral products): 68.
Irelan, William, Jr. (1888b), Eighth annual report of the State Mineralogist [includes mineral resources of the State, with contributions by W.A. Goodyear, H.A. Whiting, and Stephen Bowers]: California Mining Bureau. Report 8, 946 pp.: 633.
Laizure, Clyde McK (1926), Sonoma County: California Journal of Mines and Geology, California Mining Bureau (Report 22): 22: 314-365.
Allen, Eugene T. & Arthur L. Day (1927), Steam wells and other thermal activity at “The Geysers,” California: Carnegie Institute Washington Publication 378; [(abstract) Geol. Zentralbl. (1928), Band 38: 176-177; Neues Jahrb., Referate 2: 634-636; Scottish Geog. Mag (1928): 44: 230-231]: 39, 40, 45.
Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 245-248.
Vonsen, Magnus (1946), Minerals at “The Geysers,” Sonoma County, California: California Division Mines Report 42: 287-293.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 399, 476, 492.
Anonymous (1955), World news on mineral occurrences: Rocks & Minerals: 31: 462 (on metastibnite).
Smith, Robert Leland (1958), Some new occurrences of sassolite in the United States: American Mineralogist: 43: 1204-1205.
Steiner, A. (1958), Occurrence of wairakite at The Geysers, California: American Mineralogist: 43: 781.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 62, 63, 113, 179, 214, 258, 263, 282, 285, 288, 293, 327, 356, 382, 383.
White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 590.
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.
American Mineralogist (1970): 55: 2103-2104.
Tschernich, R. (1975), Zeolites of the world, 1975.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 53, 239, 263, 264, 265, 356, 371, 410.
Economic Geology (1984): 79: 671-695.
American Mineralogist (1988): 73: 145-152.
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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