A gem pegmatite mining area located in secs. 25 & 36, T10S, R1W, SBM, mostly to the SE of Rincon.
The iron-bearing spinel, pleonaste, is found in the Mack and Victor veins at Rincon, occurring as small (.25 mm.) crystals associated with small garnet crystals. A few imperfect octahedra have been isolated. In fragmented form, the mineral is perfectly isotropic, and deep green in color. Blue spinel has been reported from Rincon at the Mack mine.
Murdoch, Joseph & Robert W. Webb (1938), Notes on some minerals from southern California: American Mineralogist: 23: 353.
Tucker, W. B., Reed, C. H. (1939), Los Angeles Field District - Mineral Resources of San Diego County. California Journal of Mines and Geology, quarterly chapter of State Mineralogist's Report 35; January: p. 54.
Hanley, J. B. (1951), Economic Geology of the Rincon Pegmatites, San Diego County, California. Department of Natural Resources, California Division of Mines, Special Report 7B: 24 pages, illus., maps.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 676.
Weber, F. H. (1963), Mines and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: 309 p., illus., maps.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 70, 105, 177, 182, 195, 219, 238, 381.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 429.
Fisher, J. (2002), Gem and rare-element pegmatites of southern California. Mineralogical Record, Vol. 33: p. 389-390.
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