Pyrite Specimen
Pyrite Specimen
Sources Of Turquoise In The Us
Copper and aluminum are the main ingredients in turquoise. This stone is generally found in areas of low precipitation and high evaporation, and typically in close proximity to copper deposits. When it was first discovered around 3000 BC, only important people in society were allowed to own it. Things have changed since then, and today a sterling silver turquoise pendant or some piece of other jewelry containing turquoise is a must for every woman's wardrobe, especially in the Western states in the US. This article discusses turquoise mining in the United States.
Arizona
Arizona has several large copper deposits in turquoise can be found in close proximity to many of these locations. One of the most productive and famous turquoise mines in the US in the Bisbee mine. For many decades, the turquoise mine was operated as part of the copper mining being conducted here. This mine has produced some of the best quality turquoise in the world. The specimens are hard, bright blue, and have a well distributed pattern or fine dark veins. The mine is known to produce gem quality specimens that require no additional treatment other than cutting and polishing before use in jewelry. The other big copper deposit in Arizona – the Morenci mine – also has turquoise associated with it. The specimens here generally are aqua blue in color and contain black iron pyrites. The turquoise from Morenci takes a good shine and is some of the best in the world. Both these mines now produce only small amounts of turquoise. The Sleeping Beauty mine near Globe is the largest operating turquoise mine in the US. The characteristic of turquoise from this mine is that it has little if any vein pattern. For many years, the turquoise mine in Kingman was famous for its high quality stones. There is no production at the Kingman mine today.
Nevada
The Royston area in Nevada has a few operating mines. Of these, the Ajax mine is perhaps the smallest and the most recent. The specimens from this mine are blue, or a combination of blue and green. The unusual color of the specimens from this mine has raised interest in this prospect. Turquoise from the Damali mine sometimes contains zinc. The presence of zinc causes the stone to be yellow in color, and also makes it harder than most other turquoise. The Dry Creek mine in Nevada is also worthy of mention. The turquoise here contains a relatively high amount of aluminum. So the specimens from this mine are light blue, and sometimes have no blue coloration at all. The turquoise found in Esmeralda County is generally in the form of nodules. The stones range in color from solid blue, to blue with the characteristic spider webbing.
New Mexico
The Cerrillos mine in New Mexico deserves special mention. The first turquoise mining operations were carried out here, about 10 miles from Santa Fe. The color of the stone has ranged from khaki green to a brilliant bluish green. The specimens from this mine are generally very hard and can be polished to a high shine. Production from this mine today is quite low. For many years, the Tyronne mine near Silver City was known for its turquoise production. However, a change in the copper mining process here has put an end to turquoise mining here.
It should be noted that although gem-quality turqoise is always preferred, some applications may be better suited for a lower grade stabilized turquoise peice. An example of this would be a freshwater pearl necklace where turquoise is used as a secondary element such as accent beads or a pendant.
About the Author
Gemstone jewelry and digital hi-tech are two subjects that are dear to this author. He reads extensively about gems, their properties, and their origins. He has also authored several articles on cheap MP3 players of good quality, personal monitors, and personal computers.
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Old turquoise stones
For many Americans, gemstones turquoise resembles a typical American - mined in Arizona, New Mexico Colorado and Nevada, and a long history in Native American Jewelry.
But gem turquoise has been very important in many Eastern cultures for thousands of years. This is reflected in the English name of the pearl, because it was brought to Europe by traders from Asia Minor. But probably the wine Turquoise Turquoise mines celebrated in Iran and Egypt, not Turkey.
Turquoise, lapis lazuli long, is one of the oldest materials GEM known to man. The turquoise color is so unique that it has become standard word used to describe the tone slightly greenish yellow, and colors similar.
The legendary home of the best in the world are the turquoise mines of Nishapur in Iran. Turquoise has become an important element in the Commerce and barter of the Persians at the beginning. Persian turquoise was found in ancient graves in Turkistan and the first to third centuries AD, in graves in the Caucasus.
For centuries, turquoise waters, the most valuable from Iran, but the deposits are now Also in Afghanistan, Argentina, Australia, Brazil, China, Israel, Egypt, Mexico and Tanzania. The name "Persian Turquoise" is now generally used to designate any turquoise has no veins black or brown turquoise commonly operated in the United States and used in a style jewelry created by American Indians.
From the perspective of gemology, Turquoise is a hydrated phosphate of copper. It is quite soft, with more copies to only 6 on the Mohs scale. Despite its sweetness, very Polished Turquoise well. Turquoise is always opaque and vary in color from blue to green, sometimes with patches of pyrite or interspersed with dark veins limonite spider.
Like many precious stones, the demand of high quality turquoise is outstripping supply. This led to the development of treatment methods to improve color and durability of materials at lower cost. Turquoise is porous and soft be enhanced by the impregnation of the stone under the pressure of the hot water of acrylic resin. Resins improve the color, hardness and durability of the material. Although the materials are represented as treaties, it is considered an acceptable practice in the industry gemstones.
About the Author
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