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Unnamed Corundum occurrences [2], Soboba Hot Springs (Ritchey Hot Springs; White Sulphur Spring), San Jacinto Mountains, Riverside Co., California, USAi
Regional Level Types
Unnamed Corundum occurrences [2]Group of Occurrences
Soboba Hot Springs (Ritchey Hot Springs; White Sulphur Spring)Hot Springs
San Jacinto MountainsMountain Range
Riverside Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 51' 9'' North , 116° 54' 4'' West
Latitude & Longitude (decimal):
Locality type:
Group of Occurrences
Nearest Settlements:
PlacePopulationDistance
Banning30,945 (2017)8.4km
San Jacinto46,951 (2017)9.3km
Beaumont43,811 (2017)11.0km
Valle Vista14,578 (2011)11.7km
Cabazon2,535 (2011)12.7km


Setting:
Corundum occurrences located in Sec. 5, T4S, R1E, SBM, about 6.4 km (4.0 miles) NNE of Soboba Hot Springs (based on the coordinates of record for sec. 5), near the summit of the mountains. Is this locality the same as the Hazen Corundum prospect?

Geology:
The deposits are located along the contact of granodiorite/quartz diorite host rock and metamorphosed marine sediments. Several small biotite schist bodies at the contact zone contain random sprays and clusters of corundum crystals, up to 2 feet long and 3 inches in diameter. The crystals are included with biotite so severely that in some crystals there is partial replacement. Much of the schist has been decomposed to an iron-stained micaceous clay, which contains inclusions of quartz and feldspar. Quartz veins with feldspar and garnet occur nearby.

History:
According Fred Rynerson, the first report of corundum crystals from the area was made around 1924, by an unnamed woman about 60 years old that had brought a dozen crystals to Ward's Lapidary shop in San Diego for appraisal. The largest crystal was said to have measured approximately 2 inches long, and 3/4 inch at the base, tapering to 1/2 inch at the top. The woman reported that the crystals were scattered over the side of a small hill behind her house. Four years later, Rynerson searched several collections in Riverside County for the source of these crystals, but was unable to find any information about the deposit.

In 1939, large crystals of corundum embedded in mica schist were submitted to the Department of Geology at UCLA, by Mr. B. G. Funk of Los Angeles. These specimens showed sapphire-blue cores, with a progressively zoned gray colored outer rim included with micaceous material. The area was visited around 1940 by Joseph Murdoch and Robert W. Webb, who reported corundum crystals having been found as float in many parts of the San Jacinto Mountains. Several decades later, Mark Rogers reported that several crystals up to 12 inches long, both loose and in schist matrix, had been collected from the area in the late 1940's by a married couple of Asian decent.

In 1980, brothers Ken and Dana Gochenour visited the area several times and eventually discovered a small outcrop of corundum-bearing schist that contained crystals up to 4 inches in length. In 1999, the Gochenours reported finding the remains of an old working that contained a dark biotite schist with broken crystals up to 12 inches long and an inch in diameter. This schist had some crystals that were up to 7 inches long in situ. Several other locations were later discovered while prospecting along the surface, and over 150 pounds of large corundum crystal segments were said to have been collected from the area.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Gochenour, K. L. 2000. The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.
Calcite
Formula: CaCO3
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Clays'
Reference: Gochenour, K. L. 2000. The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.
Corundum
Formula: Al2O3
Colour: Blue zoned to grays
Description: Occurs as large crystals.
Reference: Rynerson, F. J. 1967. Exploring and Mining Gems & Gold in the West; Ch. 23, p. 151: Naturegraph Publishers, Inc., Happy Camp, California.
Corundum var: Sapphire ?
Formula: Al2O3
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
Diopside
Formula: CaMgSi2O6
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Feldspar Group'
Reference: Gochenour, K. L. 2000. The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Hornblende'
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Mica Group'
Reference: Gochenour, K. L. 2000. The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
Orthoclase
Formula: K(AlSi3O8)
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
'Pyroxene Group'
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.
Quartz
Formula: SiO2
Reference: Gochenour, K. L. 2000. The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.
Wollastonite
Formula: CaSiO3
Reference: Murdoch, J., and Webb, R. W. 1942. Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4):328-329.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
var: Sapphire ?4.CB.05Al2O3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
Grossular9.AD.25Ca3Al2(SiO4)3
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Wollastonite9.DG.05CaSiO3
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Clays'-
'Feldspar Group'-
'Hornblende'-
'Mica Group'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Grossular51.4.3b.2Ca3Al2(SiO4)3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite65.2.1.1cCaSiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(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
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Clays'-
Corundum
var: Sapphire ?
-Al2O3
'Feldspar Group'-
'Hornblende'-
'Mica Group'-
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O CorundumAl2O3
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O QuartzSiO2
O WollastoniteCaSiO3
O DiopsideCaMgSi2O6
O CalciteCaCO3
O GrossularCa3Al2(SiO4)3
O MuscoviteKAl2(AlSi3O10)(OH)2
O OrthoclaseK(AlSi3O8)
O Corundum (var: Sapphire)Al2O3
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg DiopsideCaMgSi2O6
AlAluminium
Al CorundumAl2O3
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al GrossularCa3Al2(SiO4)3
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al OrthoclaseK(AlSi3O8)
Al Corundum (var: Sapphire)Al2O3
SiSilicon
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si QuartzSiO2
Si WollastoniteCaSiO3
Si DiopsideCaMgSi2O6
Si GrossularCa3Al2(SiO4)3
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si OrthoclaseK(AlSi3O8)
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca WollastoniteCaSiO3
Ca DiopsideCaMgSi2O6
Ca CalciteCaCO3
Ca GrossularCa3Al2(SiO4)3
FeIron
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Murdoch, J., and Webb, R. W. (1942), Notes of Some Minerals from Southern California, III: Corundum and Associated Minerals near Banning, San Jacinto Mountains, California. The American Mineralogist. 27(4): 328-329.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 161.
Rynerson, F. J. (1967), Exploring and Mining Gems & Gold in the West; Ch. 23: 151: Naturegraph Publishers, Inc., Happy Camp, California.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 143.
Gochenour, K. L. (2000), The Rediscovery of Corundum Crystals from the San Jacinto Mountains, Riverside County, California Lithosphere bulletin, May/June. Fallbrook Gem and Mineral Society, Inc., Fallbrook, California.

Mindat Articles

Corundum Crystals from the San Jacinto Mountains by K. L. Gochenour 2000 by Scott L. Ritchie


Other Regions, Features and Areas containing this locality

North America
Pacific PlateTectonic Plate

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