These mines are typically very small - with a few employees who often work part-time. Gemstone mining employment in the entire United States is estimated to be between 1200 and 1500 people. A significant portion of the United States' production of colored stones is done by collectors, gem ...
This our favorite book about opal. It clearly describes the many different types of opal in language that is easy to understand in a 6 1/2" x 9 1/4" hardcover with 212 pages.More information, table of contents. Turquoise: Mines, Minerals and Wearable Art ...
about 1.5 km below the surface and over a period of millions of years other magma intrusions forced their way into this granite, forcing it up into mountain ranges, remelting it and recrystalizing it to form the amazonite microcline that can be found now in mines at nearly 3000m in ...
This stone can be found in China, India, Kenya, Madagascar, Namibia, Russia and the state of Colorado and Nevada in the United States. In recent years the gemstone Amazonite has been used in all kinds of jewelry from Victorian Jewelry to Southwest Jewelry. Amazonite is generally opaque and ...
Azurite:Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits and is between 3.5 to 4 on the Mohs hardness scale. In the early 19th century, Azurite was also known as chessylite after the type locality at Chessy-les-Mines near Lyon, France. The blue ...
Fire agate deposits are found in the areas between Kingman, Arizona and Needles, California, as well as the surrounding areas of the Colorado River.Mexican fire agate comes from the mines of Calvillo in the state of Aguascalientes, Mexico. There are 23 known mines near the mountains of ...
the 1920s, and until the early 1980's, the State was the largest producer in the US. In this era of small turquoise operations, it may again be the largest producer. It is estimated that over the years, more than 100 different mines and prospects located in Nevada have produced ...
Moukaite is found only in mines in Australia. It is also known as Mookite, Mookaite Jasper, and Hicorite Jasper. Moukaite forms in erosion areas of mountains as a filler in cracks. Foreign materials, such as sand, clay and iron, make up the beautiful red, yellow, and orange colors. ...
Significant amounts of turquoise have been produced in California, Colorado, Utah, Texas, and Arkansas. Most of the turquoise mined in the United States is a byproduct of copper production. The large open-pit copper mines excavate down through the shallow rock units where the turquoise is ...