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

Beneath tents and canopies, on block after block, rested every kind of stone imaginable: the opaque, soapy pastels of angeline; dark, mossy-toned epidote; tourmaline streaked with red and green.

From The Guardian

“That’s the iron silicate minerals epidote and chlorite. Those two green minerals are part of the bull’s eye.”

From National Geographic

It is usually black in color, opaque, and is related to epidote in form and composition.

From Project Gutenberg

The purer beds recrystallize as marbles, but where there has been originally an admixture of sand or clay lime-bearing silicates are formed, such as diopside, epidote, garnet, sphene, vesuvianite, scapolite; with these phlogopite, various felspars, pyrites, quartz and actinolite often occur.

From Project Gutenberg

Zoisite, zoi′sīt, n. a mineral closely allied to epidote.

From Project Gutenberg