Turquoise
noun
1.
Also, turquois. 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.
Compare bone turquoise.
2.
Also called turquoise blue. a greenish blue or bluish green.
noun
1.
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: CuAl6(PO4)4(OH)8.4H2O
2.
the colour of turquoise
(as adjective): a turquoise dress
turquoise
(tûr’kwoiz’, -koiz’)
A blue to bluish-green or yellowish-green triclinic mineral that occurs in reniform (kidney-shaped) masses with surfaces shaped like a bunch of grapes, especially in aluminum-rich igneous rocks such as trachyte. In its polished blue form it is prized as a gem. Chemical formula: CuAl6(PO4)4(OH)8·5H2O
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