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Definition of EPIDOTE
: a yellowish-green mineral Ca2(Al,Fe)3Si3O12OH usually occurring in grains or columnar masses and sometimes used as a gemstone
Origin of EPIDOTE
French épidote, from Greek epididonai to give in addition, from epi- + didonai to give — more at date
First Known Use: 1808
Any of a group of colourless to green or yellow-green silicate minerals with the general chemical formula AB(SiO)(SiO)O(OH), in which A is usually calcium (Ca) and B is generally aluminum (Al), although other elements are sometimes substituted. The epidote minerals occur as reaction products of other (earlier) minerals in low-grade (formed under relatively low-temperature, low-pressure conditions), regionally metamorphosed rocks, where their occurrence is used as an indicator of metamorphic grade.