An Etymological Dictionary of Astronomy and Astrophysics

A greenish blue mineral consisting of aluminium phosphate colored by traces of copper.

Etymology (EN): From M.Fr. turquoise (M.E. turkeis), from O.Fr. turqueise “Turkish,” because it was first brought to Europe from Turkestan. The gem does not occur in Turkey.

Etymology (PE): Mid.Pers. pirôzak, pirôcak, cf. Skt. peraja, peroja.