Tur*quoise", Tur*quois" [F. turquoise; cf. Pr. & Sp. turquesa, It. turchese, turchina, LL. turchesius, turchina; -- so called because first brought from Turkey. See 1st Turkey.] Min.
A hydrous phosphate of alumina containing a little copper; calaite. It has a blue, or bluish green, color, and usually occurs in reniform masses with a botryoidal surface.
[Formerly written also turcois
, and turkois
⇒ Turquoise is susceptible of a high polish, and when of a bright blue color is much esteemed as a gem. The finest specimens come from Persia. It is also found in New Mexico and Arizona, and is regarded as identical with the chalchihuitl of the Mexicans.
© Webster 1913.