Fig. 1. Area southeast of Palm Springs, California, outlined in red and containing x-symbols is the La Quinta quartz diorite (map modified after a portion of the Santa Ana Sheet of the Geologic Map of California, California Division of Mines and Geology, compiled by T. H. Rogers, 1965). Location of loose sphene crystals in sandy desert soils on weathered sphene-bearing quartz diorite occurs in the east half of Section 36, T6S, R5E, of Toro Peak 7 1/2 Minute Quadrangle, California. Numbers indicate locations of chemically analyzed rocks (Table 1). Road is route 74. Contour interval is 20 feet.