What does "epidote" mean?

Epidote: 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. Note: The Epidote group includes ordinary epidote, zoisite or lime epidote, piedmontite or manganese epidote, allanite or serium epidote.

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