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Ep"idote (), n.[Gr. to give besides; over + to give: cf. F. 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. The Epidote group includes ordinary epidote, zoisite or lime epidote, piedmontite or manganese epidote, allanite or cerium epidote.
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