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