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.
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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