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)

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

Derived Forms

• epidotic, adjective

Other Words From

• ep·i·dot·ic [ep-i-, dot, -ik], adjective

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 )

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

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg