Id'o-crāse, n.

(Synop., § 130), n. [Fr. idocrase, from Gr. εἶδος, form, and κράσις, mixture, from κεραννύναι, to mix; It. idocrasia.] (Min.) A mineral, occurring either in massive or in modified square prisms, presenting a handsome brown or brownish-yellow color. It consists essentially of silica, alumina, and lime. It is the Vesuvian of Werner. Cyprine is the name of a rose-red variety. Dana.