Ch. 3: Precious Gem stones in 1911

Ch. 3: Precious Gem stones in 1911 Page of 105 Ch. 3: Precious Gem stones in 1911 Text size:minus plus Restore normal size   Mail page  Print this page
1062
MINERAL RESOURCES.
of the mineral from that State is rather pale colored. Rose quartz of varying quality has been found in Connecticut and New York. Several deposits have been located in California in widely separated areas; among these are the Parson claim, described below, several deposits near Lemon Cove and Badger, in Tulare and Fresno coun­ties, in Hemet Valley, Riverside County, and in San Diego County.
CALIFORNIA.
The Summer Rose quartz claim of W. D. and George W. Parson is about 8 miles south of east of California Hot Springs, probably in Tulare County near the Kern County line. It is en the west side of Bull Run Ridge in the roughly dissected plateau-like country east of the first high ridge of the Sierra Nevada, a few miles west cf Kern River. The elevation at the mine, determined barometrically, is about 7,000 feet above sea level, or nearly 4,000 feet higher than California Hot Springs. The region around the prospect is well timbered with pines, spruce, fir, and arbor vitse.
The rose quartz ledge was discovered some 15 years ago by George W. Parson, but little attention was paid to it until 1908, when speci­mens were taken and submitted to dealers. The Summer Rose claim was located in October, 1910. Only assessment work has been done at the prospect, consisting of openings in the hard rock in search of gem material. Much care is required in this process in order that valuable mineral may not be destroyed.
The country over a large area surrounding the prospect is granitic in nature and in the field might be called hornblende-biotite granite. A specimen from adjoining the rose quartz deposit, examined under the microscope, contained andesine and a little orthoclase feldspar, dark-brown biotite, dark-green hornblende, considerable quartz, a little iron ore, and apatite. Such a rock is intermediate between monzonite and quartz diorite, and here might be called coarse quartz diorite. It has disintegrated to a gravelly sandy soil, through which occur spheroidal bowlders of harder rock. The rose quartz outcrops on the steep slope near the crest of a ridge. It is associated with fine graphic granite in a mass of pegmatite. The quartz mass stands about 25 feet above the outcrop on the lower side and is but little higher than the surface of the ground on the upper side. The width exposed between the base of the outcrop and the contact with graphic
g ranite at the top is about 35 feet, but the true thickness could not be determined. About 80 feet of the quartz is exposed in a direction N. 10° W. It is probable the ledge strikes west of north and dips to the west about with the slope of the hill. At the south end of the outcrop the quartz ledge is covered by soil and brush, and at the north it ends rather abruptly on the hillside.
The quartz has been broken by joints into columns and blocks ranging from over 1 foot thick to sheets as thin as one-sixteenth of an inch. Some of it has been crushed into coarse granular masses. Part of the quartz is white, but most of it is rose colored. In places patches of dark rose quartz occur in white or pale colored material. In the same way translucent and nearly clear rose quartz are inclosed in opaque quartz. The gem mineral ranges in color from nearly color­less to very pale delicate pink to deep pink, and some of it has a magenta tint. Much of it is translucent and somewhat opalescent, and
Ch. 3: Precious Gem stones in 1911 Page of 105 Ch. 3: Precious Gem stones in 1911
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US Geol. Surv. 1911. Gemstones, Metals.
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