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Unnamed Piemontite occurrence [1] (San Gorgonio Pass), Whitewater (White Water), San Bernardino Mountains, Riverside Co., California, USAi
Regional Level Types
Unnamed Piemontite occurrence [1] (San Gorgonio Pass)Occurrence
Whitewater (White Water)- not defined -
San Bernardino MountainsMountain Range
Riverside Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 59' 25'' North , 116° 39' 55'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Morongo Valley3,552 (2011)10.0km
Cabazon2,535 (2011)13.8km
Garnet7,543 (2011)14.8km
Desert Hot Springs28,335 (2017)15.2km
Banning30,945 (2017)20.7km


An occurrence located in sec. 22, T2S, R3E, SBM, 7.7 km (4.8 miles) NNW of Whitewater (town), along the W canyon wall of the Whitewater River, W of the Whitewater Trout farm.

Piemontite-bearing gneiss, forming part of a pre-Cretaceous metamorphic complex which crops out in the southern foothills of the San Bernardino Mountains. Along the Banning fault, which trends E-W along the north side of San Gorgonio pass, this complex is thrust over Pliocene and Pleistocene sedimentary and volcanic rocks. The gneisses crop out in the area North of this fault.

While the article cited below vaguely refers to the locality as San Gorgonio pass, the article deals with two specific outcrops. The one described here is located on the west side of the Whitewater River. The other outcrop is located further West within the Morongo Indian Reservation, about 0.6 miles West of Stubby Canyon. Boulders of piemontite-bearing gneiss also occur in Pliocene conglomerate in the Painted Hills, east of the Whitewater river.

The piemontite gneiss and associated epidote gneiss are light-colored rocks which form a layered zone within the metamorphic complex. The typical rock in the surrounding area is a dark-colored hornblende-biotite gneiss. About 75-80% of the piemontite gneiss consists of quartz, plagioclase and microcline; the remainder consists of piemontite, mica, amphibole, pyroxene, garnet and hematite in varied proportions. Bright red piemontite-rich layers and pods are prominent features. Pegmatitic lenses, layers and dykes are common, but usually only some inches long. They contain all the minerals of the gneisses and also up to 25% of ilmenite.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Calcite
Formula: CaCO3
Reference: David Singer: Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. (Senior honors thesis, Department of Geological Sciences, University of Michigan; advisors: Eric Essene and Casey Donohue).
Diopside
Formula: CaMgSi2O6
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Description: Mn-bearing.
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Hematite
Formula: Fe2O3
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Hollandite
Formula: Ba(Mn4+6Mn3+2)O16
Description: with over 2.0% W.
Reference: David Singer: Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. (Senior honors thesis, Department of Geological Sciences, University of Michigan; advisors: Eric Essene and Casey Donohue).
Hydroxylapatite
Formula: Ca5(PO4)3(OH)
Description: with up to 8 wt% As, forming a series towards johnbaumite.
Reference: David Singer: Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. (Senior honors thesis, Department of Geological Sciences, University of Michigan; advisors: Eric Essene and Casey Donohue).
Ilmenite
Formula: Fe2+TiO3
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Microcline
Formula: K(AlSi3O8)
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Piemontite
Formula: {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Quartz
Formula: SiO2
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Rutile
Formula: TiO2
Reference: David Singer: Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. (Senior honors thesis, Department of Geological Sciences, University of Michigan; advisors: Eric Essene and Casey Donohue).
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Smith, D., and Albee, A.L. (1967): Contributions to Mineralogy and Petrology 16, 189-203.
Titanite
Formula: CaTi(SiO4)O
Description: with 5% Sb!
Reference: David Singer: Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. (Senior honors thesis, Department of Geological Sciences, University of Michigan; advisors: Eric Essene and Casey Donohue).

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Hollandite4.DK.05aBa(Mn4+6Mn3+2)O16
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
Hydroxylapatite8.BN.05Ca5(PO4)3(OH)
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Piemontite9.BG.05a{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB8X16
Hollandite7.9.1.1Ba(Mn4+6Mn3+2)O16
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Hydroxylapatite41.8.1.3Ca5(PO4)3(OH)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Piemontite58.2.1a.11{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H HydroxylapatiteCa5(PO4)3(OH)
CCarbon
C CalciteCaCO3
OOxygen
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O CalciteCaCO3
O SpessartineMn32+Al2(SiO4)3
O QuartzSiO2
O MicroclineK(AlSi3O8)
O Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
O MuscoviteKAl2(AlSi3O10)(OH)2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O HydroxylapatiteCa5(PO4)3(OH)
O RutileTiO2
O HematiteFe2O3
O IlmeniteFe2+TiO3
O TitaniteCaTi(SiO4)O
O DiopsideCaMgSi2O6
O HollanditeBa(Mn64+Mn23+)O16
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg DiopsideCaMgSi2O6
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SpessartineMn32+Al2(SiO4)3
Al MicroclineK(AlSi3O8)
Al Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
SiSilicon
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SpessartineMn32+Al2(SiO4)3
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si TitaniteCaTi(SiO4)O
Si DiopsideCaMgSi2O6
PPhosphorus
P HydroxylapatiteCa5(PO4)3(OH)
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca CalciteCaCO3
Ca Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Ca HydroxylapatiteCa5(PO4)3(OH)
Ca TitaniteCaTi(SiO4)O
Ca DiopsideCaMgSi2O6
TiTitanium
Ti RutileTiO2
Ti IlmeniteFe2+TiO3
Ti TitaniteCaTi(SiO4)O
MnManganese
Mn SpessartineMn32+Al2(SiO4)3
Mn Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Mn HollanditeBa(Mn64+Mn23+)O16
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe HematiteFe2O3
Fe IlmeniteFe2+TiO3
BaBarium
Ba HollanditeBa(Mn64+Mn23+)O16

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Smith, David, and Albee, A.L. (1967): Petrology of a Piemontite-bearing Gneiss, San Gorgonio Pass, California. Contributions to Mineralogy and Petrology: 16: 189-203.
Singer, David, Highly oxidized rocks from the San Gorgonio Pass, California; Petrologic and thermodynamic calculations. Senior honors thesis, Department of Geological Sciences, University of Michigan (advisors: Eric Essene and Casey Donohue).

Other Regions, Features and Areas containing this locality

North America
Pacific PlateTectonic Plate
USA

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