Turquoise
an amorphous us mineral TURRET blue, bluish-green, apple-green; streak, white; rarely sub-translucent, mostly opaque. Composition: Phosphoric acid, 32.6; alumina, 46.9; water, 20.5-100, whence the formula, Probably the Callais, Callaina, and Callaica of Pliny. A gem stone much used in ancient times in Persia, and in prehistoric times by the ancient Mexicans under the name of chalchihuitl. Originally found in Persia, where the best stones for jewelry purposes are still obtained, ed, through the locality of the Mexican chalchihuitl has lately been discovered.