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Cahuilla District, Riverside Co., California, USA

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Latitude & Longitude (WGS84): 33° 32' 52'' North , 116° 44' 42'' West
Latitude & Longitude (decimal): 33.54800,-116.74500


Summary:
Numerous pegmatite dikes are present on and near Cahuilla Mountain, chiefly within masses of tonalite and more basic intrusive rocks. Dikes on the south side of the mountain have yielded commercial feldspar and quartz, and several pegmatites on the east side and on Little Cahuilla Mountain to the northwest have been worked for lepidolite and gem tourmaline, beryl and spodumene.

Mindat Articles

Black Tourmaline from Little Cahuilla Mountain by K. L. Gochenour 1988 by Scott L. Ritchie


Mineral List

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

33 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Holocene - Pliocene
0 - 5.333 Ma
Quaternary alluvium and marine deposits

Age: Cenozoic (0 - 5.333 Ma)

Stratigraphic Name: Temescal Formation; Modesto Formation; Victor Formation; Alameda Formation; Aromas Red Sands; Bautista Beds; Brawley Formation; Borrego Formation; Burnt Canyon Breccia; Cabezon Fanglomerate; Campus Formation; Casitas Formation; Chemehuevi Formation; Corcoran Clay; Cushenbury Springs Formation; Dos Picachos Gravels; Dripping Springs Formation; Frazier Mountain Formation; Friant Formation; Harold Formation; Heights Fanglomerate; Hookton Formation (part); Huichica Formation; La Habra Formation; Manix Lake Beds; Mohawk Lake Beds; Montezuma Formation; Nadeau Gravel; Ocotillo Conglomerate; Orcutt Formation; Pacoima Formation; Pauba Formation; Peckham Formation; Pinto Formation; Resting Springs Formation; Riverbank Formation; Rohnerville Formation; San Dimas Formation; Shoemaker Gravel; Temecula Arkose; Battery Formation; Bay Point Formation; Colma Formation; Lindavista Formation; Lomita Marl; Merritt Sand; Millerton Formation; Palos Verdes Sand; San Pedro Formation; Sweitzer Formation; Timms Point Silt

Description: Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.

Lithology: Major:{coarse alluvium}, Minor:{fine alluvium}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region


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

Kunz, G. F. (1905), Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: 121-22.

Webb, R. W. (1942), Two Andalusite Pegmatites from Riverside County, California. The American Mineralogist: 28(11-12): 581-593.

Jahns, R. H. (1954), Northern Part of the Peninsular Range Province, Geologic Guide No. 5: in Jahns, R. H., ed., Geology of Southern California: California Division of Mines Bulletin 170.

Murdoch, Joseph & Webb, Robert W. (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 315.

Rynerson, F. J. (1967), Exploring and Mining Gems & Gold in the West; Ch. 17, p. 118-120: Naturegraph Publishers, Inc., Happy Camp, California.

Gochenour, K. (1988), Black Tourmaline from Little Cahuilla Mountain, Riverside County, California. Rocks and Minerals, 63(6): 440-444.

Fisher, J. (2002), Gem and rare-element pegmatites of southern California. Mineralogical Record 33(5): 363-407.

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