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epidote

(ep′ə dōt′)

noun

hydrous calcium aluminum iron silicate, a yellowish-green to black mineral, Ca(AlFe)SiO(OH), found as monoclinic crystals, grains, or masses and sometimes used as a gem

Origin: Fr épidote < Gr epididonai, to give besides, increase < epi-, over + didonai, to give (see date): so named by R.-J. Haüy (1743-1822), Fr mineralogist; from the enlarged base of some of the crystal forms

Related Forms:

epidotic adjective

See epidote in American Heritage Dictionary 4

noun

A lustrous yellow, green, or black mineral, Ca₂(Al, Fe)₃(SiO₄)₃OH, commonly found in metamorphic rock.

Origin:

Origin: French épidote

Origin: , from Greek epididonai, to give in addition, increase (from the greater length of its crystals compared with those of related minerals)

Origin: : epi-, epi-

Origin: + didonai, to give; see dō- in Indo-European roots

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Related Forms:

epˌi·dotˈic (-dŏtˈĭk) adjective

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