3036 x 3029 px | 25,7 x 25,6 cm | 10,1 x 10,1 inches | 300dpi
Data acquisizione:
11 dicembre 2007
Altre informazioni:
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminum. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. Turquoise was among the first gems to be mined, and while many historic sites have been depleted, some are still worked to this day. The Southwest United States is a significant source of turquoise. Arizona is currently the most important producer of turquoise by value. Several mines exist in the state, two of them famous for their unique color and quality and considered the best in the industry.
