Epidote

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EP'IDOTE, n. [From Gr.; so named from the apparent enlargement of the base of the prism in one direction. It is called by Werner, pistazit, and by Hausmann, thallit.]
A mineral occurring in lamellar, granular or compact masses, in loose grains, or in prismatic crystals of six or eight sides, and sometimes ten or twelve. Its color is commonly some shade of green, yellowish, bluish or blackish green. It has two varieties, zoisite and aranaceous or granular epidote.
Epidote is granular or manganesian.