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epidote

[ ep-i-doht ]

noun

  1. a mineral, calcium aluminum iron silicate, Ca 2 (Al, Fe) 3 Si 3 O 12 (OH), occurring in green prismatic crystals.


epidote

/ ˈɛpɪˌdəʊt; ˌɛpɪˈdɒtɪk /

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)
“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

/ ĕpĭ-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: Ca 2 (Al, Fe) 3 (SiO 4 ) 3 OH.


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Derived Forms

  • epidotic, adjective
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Other Words From

  • ep·i·dot·ic [ep-i-, dot, -ik], adjective
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Word History and Origins

Origin of epidote1

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

Origin of epidote1

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
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Example Sentences

Crystalline epidote, and whitish quartz, apparently from a vein.

Purplish-brown epidote, with small nests or concretions of green epidote and quartz; forming a sort of amygdaloid.

Conglomerate, containing angular fragments of yellowish-grey quartz-rock, in a base of compact epidote.

A nearly uniform greenish compound of epidote intimately mixed with quartz, also occurs at this place.

Whether the colour depends upon epidote, chlorite, or some other substance, we were not able to determine.

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epidioriteepidural