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Cascade Canyon, San Antonio Canyon, San Gabriel Mts, San Bernardino Co., California, USA

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An E-W-trending branch of San Antonio Canyon located in the NE¼SE¼ sec. 36, T2N, R8W, SBM.

Approximate elevation of mineralized area is between 4500 and 5000 feet. Geologically, the area consists of metamorphic rock intruded by some granitic masses. Principal stratified layers have an east-west strike and a north dip of about 60 degrees. Beds from north to south consist of quartzite, limestone followed by quartzite, limestone and gneiss. This series is correlated with some paleozoic limestone in the San Bernardino mountains. Mineralization of the area is probably in part due to the intrusion of the igneous mass.

At least 20 minerals can be collected in the Cascade canyon area, among them lazurite, diopside, corundum, "hydrotroilite" and phlogopite. Lapis lazuli occurs in the limestone in small bands from 1/8 inch to six inches wide, sometimes containing pyrite crystals. Corundum has not been found in the canyon proper, but good specimens have been obtained in San Antonio wash. Crystals are from 1/4 inch to one inch in length and are of a pinkish color.

Large variety of metamorphic rocks. Warning: very steep topography subject to landslides. NOTE: This canyon crosses the county lines into Los Angeles County.

Mineral List

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

26 entries listed. 12 valid minerals.

Localities in this Region

The above list 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.


Louderback, George Davis & Walter C. Blasdale (1910), Ruby corundum from San Bernardino County, California (abstract): Science, new series: 32: 31; […Geological Society of America Bulletin: 21: 793 (1910)].

Merriam, R. and Laudermilk, J. D. 1936. Two Diopsides from Southern California. The American Mineralogist: 21(11): 715-718.

Eaton, A.L. (1946), Pomona club collects at mineralized Cascade Canyon. The Desert Magazine, Volume 9 Number 10, August. Desert Press, Inc. El Centro, California, 40pp.: 9(10): 31.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 161.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 143, 426.

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