[tur-koiz, -kwoiz] 
| 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. |
| tur·quoise (tûr'kwoiz', -koiz') n.
[Middle English turkeis and French turquoise, both from Old French (pierre) turqueise, Turkish (stone), turquoise, feminine of turqueis, Turkish, from Turc, Turk; see Turk.] tur'quoise' adj. |
| turquoise (tûr'kwoiz', -koiz') Pronunciation Key
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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