epidote
Concise Oxford English Dictionary © 2008 Oxford University Press:
epidote /ˈɛpɪdəʊt/
▶noun a lustrous yellow-green mineral consisting of a silicate of calcium, aluminium, and iron.
– origin C19: from Fr. épidote, from Gk epididonai ‘give additionally’ (because of the length of the crystals).
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