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Turquoise
opaque, blue-to-green mineral / From Wikipedia, the free encyclopedia
For the colour, see Turquoise (colour).
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.
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The word 'turquoise' means Turkish in French.