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[ep-i-doht] /ˈɛp ɪˌdoʊt/
a mineral, calcium aluminum iron silicate, Ca 2 (Al, Fe) 3 Si 3 O 12 (OH), occurring in green prismatic crystals.
1800-10; < French épidote < Greek *epidotós given besides, increased (verbid of epididónai), equivalent to epi- epi- + dotós given (verbid of didónai)
Related forms
[ep-i-dot-ik] /ˌɛp ɪˈdɒt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for epidote
  • Veinlets of epidote, milky quartz, and anthophyllite cut the greenstone in many places.
  • Plagioclase is variably altered to epidote, white mica, and chlorite.
  • epidote and white mica are ubiquitous secondary minerals.
  • Alteration minerals include chlorite, epidote, and fine-grained sericite.
British Dictionary definitions for epidote


a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic crystalline form: common in metamorphic rocks. Formula: Ca2(Al,Fe)3(SiO4)3(OH)
Derived Forms
epidotic (ˌɛpɪˈdɒtɪk) adjective
Word Origin
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
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epidote in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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