epidotic

epidote

[ep-i-doht]
noun
a mineral, calcium aluminum iron silicate, Ca 2 (Al, Fe) 3 Si 3 O 12 (OH), occurring in green prismatic crystals.

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

epidotic [ep-i-dot-ik] , adjective
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World English Dictionary
epidote (ˈɛpɪˌdəʊt)
 
n
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)
 
[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]
 
epidotic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
epidote   (ěp'ĭ-dōt')  Pronunciation Key 
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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