Note 11 — Chapter VI · Industry, Commerce, and Social Organization; Fights, Wounds and Trepanation.

Calaïte differs from the turquoise by an equivalent of aluminium; it was described by M. Damour in 1864. It is said that traces of it have been found in the tin mines of Montebras, which appear to have been worked from prehistoric times.—Mat., 1881, p. 166, etc. Cartailhac: Bul. Soc. Anth., 1881, p. 295.