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Turquoise

opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium
Turquoise.pebble.700pix.jpg

Turquoise is an opaque (cannot be seen through), blueish-green mineral. It is not common and can be valuable in finer grades. It has been prized as a gem and ornamental stone for thousands of years because of its interesting coloring.

The word Turquoise means Turkish in French.