Turquoise

Turquoise is the name of a bluish green color, based on the gem of the same name. The word turquoise comes from the French for Turkish, as the gem was originally imported from Turkey. The first recorded use of turquoise as a color name in English was in 1573.

Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl ₆ (PO ₄ ) ₄ (OH) ₈ ་ 4H ₂ O. 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.