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epidote

[ep-i-doht]
noun
  1. a mineral, calcium aluminum iron silicate, Ca2(Al, Fe)3Si3O12(OH), occurring in green prismatic crystals.
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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. 2018

Examples from the Web for epidote

Historical Examples

  • Mica, epidote, and chlorite are also present as accessories.

    Volcanoes: Past and Present

    Edward Hull

  • A rock composed of quartz and epidote is known as epidosite.

  • Fragments of epidote, porphyry and flinty quartzite lay around.

  • Quartz is not much harder than epidote; the strength is only supposed to be in some proportion to the squares of the diameters.

  • He lets the pale little film of epidote grow right past him; stopping his own summit for it; and he never himself grows any more.

British Dictionary definitions for epidote

epidote

noun
  1. 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)
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Derived Formsepidotic (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
epidote in Science

epidote

[ĕp′ĭ-dōt′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.