A gemstone and rare earth element (REE) pegmatite area located approximately 4 miles south of the town of Oak Grove. The area is situated along the northern and southern sides of the Aguanga Mountain ridgeline, which is the southeast spur of Palomar Mountain. The mountain has also been referred to as Smith Mountain.
References
Kunz, G. F. (1905), Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37.
Merrill, F. J. H. (1914), Geology and Mineral Resources of San Diego and Imperial Counties: Gems, Lithia Minerals. California State Mining Bureau, San Francisco, Cal. California State Printing Office, December. Chapter 1, pages 61-78.
Schrader, Frank Charles, R.W. Stone & Samuel Sanford (1917), Useful minerals of the United States (a revision of Bulletin 585): USGS Bulletin 624; […(abstract): Geol. Zentralbl. 28: 229 (1922)]: 42.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 79.
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