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Located approximately 25 kilometers (15 miles) southeast
of the better-known Pala Pegmatite District, the Rincon pegmatites
have produced excellent and important specimens.
Within the area is a cluster of pegmatitic dikes.
Most of the pegmatites are mineralogically simple and contain only
quartz, perthite and plagioclase as essential minerals, but a few contain schorl,
beryl, garnet, and lithium-bearing minerals.
The pegmatites are extremely coarse-grained dikes or
veins, with crystals up to 30 centimeters (12 inches) in length.
They appear to have been intruded along a set of pre-existing secondary
joints in the walls of the Southern California batholith rocks, and very slow
cooling and fractional crystallization of the intruded magma accounts for the
large crystal size and zones of minerals in the dikes.
The primary vegetation is chaparral.
are mines and roads in the area, and the result of extensive prospecting is
John B., 1951. Economic Geology of
the Rincon Pegmatites, San Diego County, California. Calif. Div. of Mines Spec.
Rep't. 7B, 24 pp.
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