Ep'i-dōte, n.

n. [Fr. épidote, from Gr. ἐπιδιδόναι, to give besides, from ἐπί and διδόναι, to give; so named from the enlargement of the base of the primary, in some of the secondary forms. Cf. ARENDALITE.] (Min.) A mineral of yellowish-green, brownish-green, brown, and ash-gray colors, occurring both granular, massive, columnar, and in monoclinic crystals. It is quite hard, and is vitreous in luster. Yellowish-green is its most characteristic color. It consists of silica, alumina, lime, and oxide of iron, or manganese.

Epidote rock, a gray or brownish variety of epidote; —called also zoisite. Dana.