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The Geysers, West Mayacmas Mining District, Sonoma County, California, USAi
Regional Level Types
The GeysersGeothermal Field
West Mayacmas Mining DistrictMining District
Sonoma CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
38° 48' 6'' North , 122° 48' 11'' West
Latitude & Longitude (decimal):
38.80194,-122.80306
GeoHash:
G#: 9qbstx9t9
GRN:
N26W70
Type:
Geothermal Field
KΓΆppen climate type:
Csb : Warm-summer Mediterranean climate
Mindat Locality ID:
3575
Long-form identifier:
mindat:1:2:3575:3
GUID (UUID V4):
6dcbe669-e95c-445f-8a8a-26f84e0138e3


A geothermal/evaporite deposit located about 12 miles (ca. 19 km) 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.

The Geysers are the world's largest geothermal field, containing a complex of 18 geothermal power plants, drawing steam from more than 350 wells, located in the Mayacamas Mountains approximately 72 miles (ca. 116 km) north of San Francisco, California.

The Geysers produced about 20% of California's renewable energy in 2019.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

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

34 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Alum-(K)
Formula: KAl(SO4)2 · 12H2O
β“˜ Alunite
Formula: KAl3(SO4)2(OH)6
Description: In 3-9 cm thick veins near Lemonade Springs where it appeared hard and porcelaneous with a smooth fracture, and nearby in veins with greater witdth- where it appeared soft and resembled white clay. (Dunning & Cooper 1993)
β“˜ Alunogen
Formula: Al2(SO4)3 · 17H2O
Habit: Fine fibrous silky tufts & thick incrustation
References:
Van Nostrand Reinholt Press: 263
Allen, Eugene T. & Arthur L. Day (1927), Steam wells and other thermal activity at β€œThe Geysers,” California: Carnegie Institute Washington Publication 378: 45
Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 246
Vonsen, Magnus (1946), Minerals at β€œThe Geysers,” Sonoma County, California: California Division Mines Report 42: 290
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Mineralogica Record (1993): 24(5): 349.
β“˜ Ammonioalunite (TL)
Formula: (NH4)Al3(SO4)2(OH)6
Type Locality:
Colour: grayish white
Description: Discovered and described by Altaner et al (1988) from a single specimen in the Smithsonian Museum (NMNH 145596) where it was idetified in a physical mixture of ammonioalunite, ammoniojarosite, and amorphous silica.
β“˜ Ammoniojarosite
Formula: (NH4)Fe3+3(SO4)2(OH)6
Colour: brownish orange
Description: Found on wall rock at Devil's Pulpit
β“˜ Boussingaultite
Formula: (NH4)2Mg(SO4)2 · 6H2O
Description: Occurs particulary abundant under the overhanging rock in the main creek about 70 meters S of Devil's Pulpit. Occurs as crusts and stalactites with other sulphate minerals.
References:
Goldsmith, E. (1877), On boussingaultite and other minerals from Sonoma County, California: Academy of Natural Sciences of Philadelphia Proceedings: 28: 264
Allen, Eugene T. & Arthur L. Day (1927), Steam wells and other thermal activity at β€œThe Geysers,” California: Carnegie Institute Washington Publication 378: 45
Vonsen, Magnus (1946), Minerals at β€œThe Geysers,” Sonoma County, California: California Division Mines Report 42: 289
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
Smith, Robert Leland (1958), Some new occurrences of sassolite in the United States: American Mineralogist: 43: 1204-1205
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
Mineralogical Record (1993): 24: 349.
β“˜ Calcite
Formula: CaCO3
β“˜ Cinnabar
Formula: HgS
β“˜ Datolite
Formula: CaB(SiO4)(OH)
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜ Epsomite
Formula: MgSO4 · 7H2O
Habit: powdery
Colour: white; pale green
Description: Occurs as incrustations and stalactites.
References:
Goldsmith, E. (1877), On boussingaultite and other minerals from Sonoma County, California: Academy of Natural Sciences of Philadelphia Proceedings: 28: 265
Allen, Eugene T. & Arthur L. Day (1927), Steam wells and other thermal activity at β€œThe Geysers,” California: Carnegie Institute Washington Publication 378: 39, 45
Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 247, 267
Vonsen, Magnus (1946), Minerals at β€œThe Geysers,” Sonoma County, California: California Division Mines Report 42: 290
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
Dunning, G. S. & Cooper, J. F. (1993): History and minerals of The Geysers Sonoma County, California. Mineralogical Record (1993): 24(5): 339-352.
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Gypsum
Formula: CaSO4 · 2H2O
Habit: Long fibers & small poorly terminated crystals
Description: Found only once in an open fissure with opal, cinnabar and a yellow iron sulphate
β“˜ Halotrichite
Formula: FeAl2(SO4)4 · 22H2O
Colour: yellowish white
Description: Reportedly rich in Ni; occurs sparingly.
β“˜ Kalinite
Formula: KAl(SO4)2 · 11H2O
β“˜ Kaolinite
Formula: Al2(Si2O5)(OH)4
β“˜ Kaolinite var. Chrome-Kaolinite
Formula: (Al,Cr)2(Si2O5)(OH)4
β“˜ Letovicite
Formula: (NH4)3H(SO4)2
Habit: masses of pseudohexagonal crystals 0.03 by 0.05 mm and 0.0005mm thick
Colour: Colourless
Description: Occurs as platy micro-crystals on massive mascagnite from Boric Acid Springs along Geyser Creek Canyon.
β“˜ Mascagnite
Formula: (NH4)2SO4
Habit: As incrustations and nodules (some with a coarse fibrous interior)
Description: Occurs as incrustations and nodules during early summer months in the upper part of Geyser Creek Canyon.
References:
Van Nostrand Reinholt Press: 239
Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 246, 279
Vonsen, Magnus (1946), Minerals at β€œThe Geysers,” Sonoma County, California: California Division Mines Report 42: 288
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
Smith, Robert Leland (1958), Some new occurrences of sassolite in the United States: American Mineralogist: 43: 1205
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
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Dunning, G. S. & Cooper, J. F. (1993): History and minerals of The Geysers Sonoma County, California. Mineralogical Record: 24(5): 339-352
β“˜ Melanterite
Formula: Fe2+(H2O)6SO4 · H2O
Description: Occurs sparingly.
β“˜ Mercury
Formula: Hg
Description: Native Hg was the only ore here.
β“˜ Metacinnabar
Formula: HgS
β“˜ Metastibnite
Formula: Sb2S3
Description: As red coatings in cracks in siliceous sinter restricted to the area known as "the Big Geysers"
β“˜ Opal
Formula: SiO2 · nH2O
Description: Occurs as crusts of delicate capillary fibers.
β“˜ Pectolite
Formula: NaCa2Si3O8(OH)
Description: Widely distributed in narrow veins.
β“˜ Pentahydrite
Formula: MgSO4 · 5H2O
Description: Granular pseudomorphs of pentahydrite after epsomite
β“˜ Pickeringite
Formula: MgAl2(SO4)4 · 22H2O
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ Pyrite
Formula: FeS2
Habit: smears
Colour: brass-yellow
β“˜ Sassolite
Formula: H3BO3
Habit: Tiny transparent flakes
Description: One specimen of tiny, transparent flakes.
β“˜ Stellerite
Formula: Ca4(Si28Al8)O72 · 28H2O
β“˜ Sulphur
Formula: S8
β“˜ Titanite
Formula: CaTi(SiO4)O
β“˜ Tschermigite
Formula: (NH4)Al(SO4)2 · 12H2O
β“˜ Voltaite
Formula: K2Fe2+5Fe3+3Al(SO4)12 · 18H2O
Habit: crusts
Colour: Black, dark green
Description: Occurs sparingly.
β“˜ Wairakite
Formula: Ca(Al2Si4O12) · 2H2O
Description: Occurs lining cavities and fractures of graywacke erupted from a steam well.

Gallery:

(NH4)2Mg(SO4)2 · 6H2Oβ“˜ Boussingaultite
(NH4)3H(SO4)2β“˜ Letovicite
(NH4)2SO4β“˜ Mascagnite

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Mercury1.AD.05Hg
β“˜Sulphur1.CC.05S8
Group 2 - Sulphides and Sulfosalts
β“˜Metacinnabar2.CB.05aHgS
β“˜Cinnabar2.CD.15aHgS
β“˜Metastibnite2.DB.05Sb2S3
β“˜Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
β“˜Opal4.DA.10SiO2 Β· nH2O
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 6 - Borates
β“˜Sassolite6.AA.05H3BO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Mascagnite7.AD.05(NH4)2SO4
β“˜Letovicite7.AD.20(NH4)3H(SO4)2
β“˜Alunite7.BC.10KAl3(SO4)2(OH)6
β“˜Ammoniojarosite7.BC.10(NH4)Fe3+3(SO4)2(OH)6
β“˜Ammonioalunite (TL)7.BC.10(NH4)Al3(SO4)2(OH)6
β“˜Pentahydrite7.CB.20MgSO4 Β· 5H2O
β“˜Melanterite7.CB.35Fe2+(H2O)6SO4 Β· H2O
β“˜Epsomite7.CB.40MgSO4 Β· 7H2O
β“˜Alunogen7.CB.45Al2(SO4)3 Β· 17H2O
β“˜Halotrichite7.CB.85FeAl2(SO4)4 Β· 22H2O
β“˜Pickeringite7.CB.85MgAl2(SO4)4 Β· 22H2O
β“˜Kalinite7.CC.15KAl(SO4)2 Β· 11H2O
β“˜Tschermigite7.CC.20(NH4)Al(SO4)2 Β· 12H2O
β“˜Alum-(K)7.CC.20KAl(SO4)2 Β· 12H2O
β“˜Voltaite7.CC.25K2Fe2+5Fe3+3Al(SO4)12 Β· 18H2O
β“˜Boussingaultite7.CC.60(NH4)2Mg(SO4)2 Β· 6H2O
β“˜Gypsum7.CD.40CaSO4 Β· 2H2O
Group 9 - Silicates
β“˜Titanite9.AG.15CaTi(SiO4)O
β“˜Datolite9.AJ.20CaB(SiO4)(OH)
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Pectolite9.DG.05NaCa2Si3O8(OH)
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Kaolinite9.ED.05Al2(Si2O5)(OH)4
β“˜var. Chrome-Kaolinite9.ED.05(Al,Cr)2(Si2O5)(OH)4
β“˜Wairakite9.GB.05Ca(Al2Si4O12) Β· 2H2O
β“˜Stellerite9.GE.15Ca4(Si28Al8)O72 Β· 28H2O
Unclassified
β“˜'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hβ“˜ AluniteKAl3(SO4)2(OH)6
Hβ“˜ AlunogenAl2(SO4)3 · 17H2O
Hβ“˜ Ammonioalunite(NH4)Al3(SO4)2(OH)6
Hβ“˜ Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
Hβ“˜ Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Hβ“˜ DatoliteCaB(SiO4)(OH)
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ EpsomiteMgSO4 · 7H2O
Hβ“˜ GypsumCaSO4 · 2H2O
Hβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Hβ“˜ KaliniteKAl(SO4)2 · 11H2O
Hβ“˜ KaoliniteAl2(Si2O5)(OH)4
Hβ“˜ Letovicite(NH4)3H(SO4)2
Hβ“˜ Mascagnite(NH4)2SO4
Hβ“˜ MelanteriteFe2+(H2O)6SO4 · H2O
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ PectoliteNaCa2Si3O8(OH)
Hβ“˜ PentahydriteMgSO4 · 5H2O
Hβ“˜ PickeringiteMgAl2(SO4)4 · 22H2O
Hβ“˜ Alum-(K)KAl(SO4)2 · 12H2O
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ SassoliteH3BO3
Hβ“˜ StelleriteCa4(Si28Al8)O72 · 28H2O
Hβ“˜ Tschermigite(NH4)Al(SO4)2 · 12H2O
Hβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
Hβ“˜ WairakiteCa(Al2Si4O12) · 2H2O
Hβ“˜ Kaolinite var. Chrome-Kaolinite(Al,Cr)2(Si2O5)(OH)4
BBoron
Bβ“˜ DatoliteCaB(SiO4)(OH)
Bβ“˜ SassoliteH3BO3
CCarbon
Cβ“˜ CalciteCaCO3
NNitrogen
Nβ“˜ Ammonioalunite(NH4)Al3(SO4)2(OH)6
Nβ“˜ Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
Nβ“˜ Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Nβ“˜ Letovicite(NH4)3H(SO4)2
Nβ“˜ Mascagnite(NH4)2SO4
Nβ“˜ Tschermigite(NH4)Al(SO4)2 · 12H2O
OOxygen
Oβ“˜ AluniteKAl3(SO4)2(OH)6
Oβ“˜ AlunogenAl2(SO4)3 · 17H2O
Oβ“˜ Ammonioalunite(NH4)Al3(SO4)2(OH)6
Oβ“˜ Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
Oβ“˜ Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Oβ“˜ CalciteCaCO3
Oβ“˜ DatoliteCaB(SiO4)(OH)
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ EpsomiteMgSO4 · 7H2O
Oβ“˜ GypsumCaSO4 · 2H2O
Oβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Oβ“˜ KaliniteKAl(SO4)2 · 11H2O
Oβ“˜ KaoliniteAl2(Si2O5)(OH)4
Oβ“˜ Letovicite(NH4)3H(SO4)2
Oβ“˜ Mascagnite(NH4)2SO4
Oβ“˜ MelanteriteFe2+(H2O)6SO4 · H2O
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ PectoliteNaCa2Si3O8(OH)
Oβ“˜ PentahydriteMgSO4 · 5H2O
Oβ“˜ PickeringiteMgAl2(SO4)4 · 22H2O
Oβ“˜ Alum-(K)KAl(SO4)2 · 12H2O
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ SassoliteH3BO3
Oβ“˜ StelleriteCa4(Si28Al8)O72 · 28H2O
Oβ“˜ TitaniteCaTi(SiO4)O
Oβ“˜ Tschermigite(NH4)Al(SO4)2 · 12H2O
Oβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
Oβ“˜ WairakiteCa(Al2Si4O12) · 2H2O
Oβ“˜ Kaolinite var. Chrome-Kaolinite(Al,Cr)2(Si2O5)(OH)4
Oβ“˜ Garnet GroupX3Z2(SiO4)3
NaSodium
Naβ“˜ PectoliteNaCa2Si3O8(OH)
MgMagnesium
Mgβ“˜ Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Mgβ“˜ EpsomiteMgSO4 · 7H2O
Mgβ“˜ PentahydriteMgSO4 · 5H2O
Mgβ“˜ PickeringiteMgAl2(SO4)4 · 22H2O
AlAluminium
Alβ“˜ AluniteKAl3(SO4)2(OH)6
Alβ“˜ AlunogenAl2(SO4)3 · 17H2O
Alβ“˜ Ammonioalunite(NH4)Al3(SO4)2(OH)6
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Alβ“˜ KaliniteKAl(SO4)2 · 11H2O
Alβ“˜ KaoliniteAl2(Si2O5)(OH)4
Alβ“˜ PickeringiteMgAl2(SO4)4 · 22H2O
Alβ“˜ Alum-(K)KAl(SO4)2 · 12H2O
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ StelleriteCa4(Si28Al8)O72 · 28H2O
Alβ“˜ Tschermigite(NH4)Al(SO4)2 · 12H2O
Alβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
Alβ“˜ WairakiteCa(Al2Si4O12) · 2H2O
Alβ“˜ Kaolinite var. Chrome-Kaolinite(Al,Cr)2(Si2O5)(OH)4
SiSilicon
Siβ“˜ DatoliteCaB(SiO4)(OH)
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ KaoliniteAl2(Si2O5)(OH)4
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ PectoliteNaCa2Si3O8(OH)
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ StelleriteCa4(Si28Al8)O72 · 28H2O
Siβ“˜ TitaniteCaTi(SiO4)O
Siβ“˜ WairakiteCa(Al2Si4O12) · 2H2O
Siβ“˜ Kaolinite var. Chrome-Kaolinite(Al,Cr)2(Si2O5)(OH)4
Siβ“˜ Garnet GroupX3Z2(SiO4)3
SSulfur
Sβ“˜ AluniteKAl3(SO4)2(OH)6
Sβ“˜ AlunogenAl2(SO4)3 · 17H2O
Sβ“˜ Ammonioalunite(NH4)Al3(SO4)2(OH)6
Sβ“˜ Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
Sβ“˜ Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Sβ“˜ CinnabarHgS
Sβ“˜ EpsomiteMgSO4 · 7H2O
Sβ“˜ GypsumCaSO4 · 2H2O
Sβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Sβ“˜ KaliniteKAl(SO4)2 · 11H2O
Sβ“˜ Letovicite(NH4)3H(SO4)2
Sβ“˜ Mascagnite(NH4)2SO4
Sβ“˜ MelanteriteFe2+(H2O)6SO4 · H2O
Sβ“˜ MetacinnabarHgS
Sβ“˜ MetastibniteSb2S3
Sβ“˜ PentahydriteMgSO4 · 5H2O
Sβ“˜ PickeringiteMgAl2(SO4)4 · 22H2O
Sβ“˜ Alum-(K)KAl(SO4)2 · 12H2O
Sβ“˜ PyriteFeS2
Sβ“˜ SulphurS8
Sβ“˜ Tschermigite(NH4)Al(SO4)2 · 12H2O
Sβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
KPotassium
Kβ“˜ AluniteKAl3(SO4)2(OH)6
Kβ“˜ KaliniteKAl(SO4)2 · 11H2O
Kβ“˜ Alum-(K)KAl(SO4)2 · 12H2O
Kβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DatoliteCaB(SiO4)(OH)
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ GypsumCaSO4 · 2H2O
Caβ“˜ PectoliteNaCa2Si3O8(OH)
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
Caβ“˜ StelleriteCa4(Si28Al8)O72 · 28H2O
Caβ“˜ TitaniteCaTi(SiO4)O
Caβ“˜ WairakiteCa(Al2Si4O12) · 2H2O
TiTitanium
Tiβ“˜ TitaniteCaTi(SiO4)O
CrChromium
Crβ“˜ Kaolinite var. Chrome-Kaolinite(Al,Cr)2(Si2O5)(OH)4
FeIron
Feβ“˜ Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ HalotrichiteFeAl2(SO4)4 · 22H2O
Feβ“˜ MelanteriteFe2+(H2O)6SO4 · H2O
Feβ“˜ PyriteFeS2
Feβ“˜ VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
SbAntimony
Sbβ“˜ MetastibniteSb2S3
HgMercury
Hgβ“˜ CinnabarHgS
Hgβ“˜ MercuryHg
Hgβ“˜ MetacinnabarHgS

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/The_Geysers
Wikidata ID:Q3109025

Localities in this Region

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Other Regions, Features and Areas containing this locality

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This page 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. 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.

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 β€œThe 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 β€œThe Geysers,” Sonoma County, California: California Division Mines Report 42: 287-293.
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
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.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Bird, D.K., Schiffman, P., Elders, W.A., Williams, A.E., McDowell, S.D. (1984) Calc-silicate mineralization in active geothermal systems. Economic Geology: 79(4): 671–695.
American Mineralogist (1988): 73: 145-152.
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.
Dunning, G. S. & Cooper, J. F. (1993): History and minerals of The Geysers Sonoma County, California. Mineralogical Record 24 (5): 339-352.
en.wikipedia.org (n.d.) https://en.wikipedia.org/wiki/The_Geysers
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