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Opal Hill Mine, Mule Mountains District (Hodges Mountain District), Mule Mts (Palo Verde Mts), Riverside Co., California, USA

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Latitude & Longitude (WGS84): 33° 27' 5'' North , 114° 51' 55'' West
Latitude & Longitude (decimal): 33.45147,-114.86543
Köppen climate type:BWh : Hot deserts climate

A semiprecious gemstone (fire agate)-zeolites occurrence/mine located 7.2 km (4.4 miles) SSW of the Mule Mountains (coordinates of record), along the S canyon wall of Coon Hollow (pass).

Workings include surface openings (the topo map reflects 1 open cast mine symbol labeled "Opal Hill Mine" at this point.

Mineral List

7 valid minerals.

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

Tortonian - Chattian
7.246 - 28.1 Ma

ID: 2729332
Tertiary pyroclastic and volcanic mudflow deposits, unit 7 (Southern Mojave Desert)

Age: Cenozoic (7.246 - 28.1 Ma)

Description: Tertiary pyroclastic and volcanic mudflow deposits.

Lithology: Major:{rhyolite,dacite}, Minor:{andesite}, Incidental:{basalt}

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Perry, L. (1976a), The Opal Hill Fire Agate Mine: Gems and Minerals: No. 461: 56, 57, 77.
Tschernich, R. W. (1992): Zeolites of the world. Geoscience Press, Phoenix, Arizona: 135.

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