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The Collaborative International Dictionary of English v.0.48:

Epidote \Ep"i*dote\, n. [Gr. ? to give besides; ? over + ? to give: cf. F. ['e]pidote. So named from the enlargement of the base of the primary, in some of the secondary forms.] (Min.) A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese. [1913 Webster] Note: The Epidote group includes ordinary epidote, zoisite or lime epidote, piedmontite or manganese epidote, allanite or cerium epidote. [1913 Webster]