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Native American Art Navajo silversmithing history - page 2 of 3

For thousands of years the finest intense blue turquoise in the world was found in Persia, and the term "Persian Turquoise" became synonymous with the finest quality. This changed during the late 1800's and early 1900's when modern miners discovered or rediscovered significant deposits of high-quality turquoise in the western and southwestern United States. Material from many of these deposits was just as fine as the finest Persian. Today, the term "Persian Turquoise" is more often a definition of quality than a statement of origin, and the majority of the world's finest-quality turquoise comes from the United States, the largest producer of turquoise.

The increased acceptance of turquoise resulted in higher prices, some of the most desirable materials going for as much as $2,200 per kg. The increased demand could not be met through production of acceptable mine run materials. Therefore, an industry emerged, the business of turquoise stabilization, reconstitution, and the manufacture of synthetic and simulated turquoise. In most instances, the stabilization and reconstitution of turquoise involves the use of earthy or highly porous types of turquoise which are pressure-impregnated with hot acrylic resins. The resins improve the color, hardness, and durability of the material to a point that inexpensive porous, poorly colored, or nearly colorless materials become suitable for use in jewelry. As long as the materials are represented as treated, stabilized, or reconstituted, the marketplace can accept or reject the materials based on decisions that are purely business or economic.

In Arizona, turquoise ranks first in terms of value of production and is also the best known of its gem materials. As stated earlier, nearly all important deposits of turquoise are located near copper occurrences or in copper deposits in arid desert regions of the world. Thus, the world famous turquoise deposits associated with certain of the large Arizona copper deposits are to be expected. Turquoise is or has been mined from a number of these copper mines as a byproduct, usually by outside contractors. The financial and operating terms of the collecting contracts vary from mine to mine. Some of the operations are little more than the efforts of individual commercial collectors. Some are essentially full-scale mining operations that are simultaneous with, but separate from, the regular mining operations; and still others operate on an on-call basis as turquoise is uncovered by the regular copper mining operation. Regardless of the size or the sophistication of the initial mining or recovery operation, the actual turquoise is recovered by careful extraction using hand methods.

The production of turquoise from deposits in California can be traced back to pre-Colombian Native Americans. Prehistoric mining tools have been found in some of the old workings of the turquoise mines in San Bernardino County. Over the years, the State's deposits have produced a substantial amount of turquoise. Deposits are located in San Bernardino, Imperial, and Inyo Counties. The material occurs as nodules and as vein filling. Most of the nodules are small in size, about the size of the end of your thumb, and the vein material is about 4 millimeters thick. In the better grade materials, the color varies from a pale to a dark blue, poorer grade materials are greenish-blue and green in color. Some of the material has yellow-brown limonite spiderwebbing. In the past, a number of turquoise mines operated in California, several or more mines in each of the counties. Today, only a single mine, the Apache Canyon Mine, is commercially producing turquoise. Material from the mine is a fine blue color, hard, and takes a good polish.

Native American art Navajo turquoise history - page 3

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