- an opaque mineral, a basic hydrous copper aluminum phosphate often containing a small amount of iron, sky-blue or greenish-blue in color, cut cabochon as a gem.
- a greenish blue or bluish green.
- a greenish-blue fine-grained secondary mineral consisting of hydrated copper aluminium phosphate. It occurs in igneous rocks rich in aluminium and is used as a gemstone. Formula: CuAl 6 (PO 4) 4 (OH) 8 .4H 2 O
- the colour of turquoise
- (as adjective)
