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The Geysers, Sonoma Co., California, USA

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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:
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.

American Mineralogist (1970): 55: 2103-2104.

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.





 Map Reference: 38°48'7"N , 122°48'11"W

This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Mineral list contains entries from the region specified including sub-localities

Group 1 - Elements
  		• Sulphur1.CC.05
    S
     
    8
    Group 2 - Sulphides and Sulfosalts
  		• Cinnabar2.CD.15a
    HgS
  		• Metastibnite2.DB.05
    Sb
     
    2
    		S
     
    3
  		• Pyrite2.EB.05a
    FeS
     
    2
    Group 4 - Oxides and Hydroxides
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
    Group 6 - Borates
  		• Sassolite6.AA.05
    H
     
    3
    		BO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Alunite7.BC.10
    KAl
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
  		• Alunogen7.CB.45
    Al
     
    2
    		(SO
     
    4
    		)
     
    3
    		·17H
     
    2
    		O
  		• Ammonioalunite (TL)7.BC.10
    (NH
     
    4
    		)Al
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
  		• Ammoniojarosite7.BC.10
    (NH
     
    4
    		)Fe
    3+
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
  		• Boussingaultite7.CC.60
    (NH
     
    4
    		)
     
    2
    		Mg(SO
     
    4
    		)
     
    2
    		·6H
     
    2
    		O
  		• Epsomite7.CB.40
    MgSO
     
    4
    		·7H
     
    2
    		O
  		• Gypsum7.CD.40
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
  		• Halotrichite7.CB.85
    FeAl
     
    2
    		(SO
     
    4
    		)
     
    4
    		·22H
     
    2
    		O
  		• Letovicite7.AD.20
    (NH
     
    4
    		)
     
    3
    		H(SO
     
    4
    		)
     
    2
  		• Mascagnite7.AD.05
    (NH
     
    4
    		)
     
    2
    		SO
     
    4
  		• Melanterite7.CB.35
    FeSO
     
    4
    		·7H
     
    2
    		O
  		• Pentahydrite7.CB.20
    MgSO
     
    4
    		·5H
     
    2
    		O
  		• Pickeringite7.CB.85
    MgAl
     
    2
    		(SO
     
    4
    		)
     
    4
    		·22H
     
    2
    		O
  		• Tschermigite7.CC.20
    (NH
     
    4
    		)Al[SO
     
    4
    		]
     
    2
    		 · 12H
     
    2
    		O
  		• Voltaite7.CC.25
    K
     
    2
    		Fe
    2+
    5
    		Fe
    3+
    3
    		Al[SO
     
    4
    		]
     
    12
    		 · 18H
     
    2
    		O
    Group 9 - Silicates
  		• Datolite9.AJ.20
    CaB[OH|SiO
     
    4
    		]
  		• Epidote9.BG.05
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Prehnite9.DP.20
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
  		• Stellerite9.GE.15
    Ca[Al
     
    2
    		Si
     
    7
    		O
     
    18
    		] · 7H
     
    2
    		O
  		• Titanite9.AG.15
    CaTi[O|SiO
     
    4
    		]
  		• Wairakite9.GB.05
    Ca[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
    Unclassified Minerals
  		• 'Garnet Group'-
    X
     
    3
    		Z
     
    2
    		(TO
     
    4
    		)
     
    3
    		 (X = Ca, Fe, etc·, Z = Al, Cr, etc·, T = Si, As, V)


    29 entries listed. 28 valid minerals.

    Localities in this Region:
    USA
     
    • California
      • Sonoma Co.
        • The Geysers

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in California, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 26th Nov 2009 18:02:05