epidote

[ ep-i-doht ]

/ ˈɛp ɪˌdoʊt /

noun

a mineral, calcium aluminum iron silicate, Ca2(Al, Fe)3Si3O12(OH), occurring in green prismatic crystals.

Nearby words

Origin of epidote

1800–10; < French épidote < Greek *epidotós given besides, increased (verbid of epididónai), equivalent to epi- epi- + dotós given (verbid of didónai)

Related formsep·i·dot·ic

[ep-i-dot-ik] /ˌɛp ɪˈdɒt ɪk/, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for epidote

The feldspar is decomposed with the resulting formation of epidote, which is quite prominent.
The Long Labrador Trail|Dillon Wallace
Parallel with the micas that cause the schistosity, the growth of the quartz and epidote lenses took place.
History and Comprehensive Description of Loudoun County, Virginia|James W. Head
Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6|Various
Epidote is an abundant rock-forming mineral, but one of secondary origin.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6|Various

Epidote, often with enclosures of orthite, is by no means rare in gneisses from many different parts of the world.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2|Various

British Dictionary definitions for epidote

epidote

/ (ˈɛpɪˌdəʊt) /

noun

a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic crystalline form: common in metamorphic rocks. Formula: Ca 2 (Al,Fe) 3 (SiO 4) 3 (OH)

Derived Formsepidotic (ˌɛpɪˈdɒtɪk), adjective

Word Origin for epidote

C19: from French épidote, ultimately from Greek epididonai to increase, from didonai to give; so called because two sides of its crystal are longer than the other two sides

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for epidote

epidote

[ ĕp′ĭ-dōt′ ]

A yellowish-green or blackish-green monoclinic mineral. Epidote occurs as formless grains or as prism-shaped crystals, and is found in limestones that have undergone slight metamorphism or in igneous rocks. Chemical formula: Ca2(Al, Fe)3(SiO4)3OH.