Dictionary.com
Thesaurus.com

epidote

American  
[ep-i-doht] / ˈɛp ɪˌdoʊt /

noun

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

epidote British  
/ 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 Scientific  
/ 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.

Other Word Forms

  • epidotic adjective

Etymology

Origin of epidote

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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 • Sep. 17, 2019

The “green” part of the name is derived from green minerals like chlorite, serpentine, and epidote, and the “schist” part is applied due to the presence of platy minerals such as muscovite.

From Textbooks • Jan. 1, 2017

In a variation on independent tetrahedra called sorosilicates, there are minerals that share one oxygen between two tetrahedra and include minerals like pistachio-green epidote, a gemstone.

From Textbooks • Jan. 1, 2017

During the ore-forming process, some of the original minerals in these rocks are altered to potassium feldspar, biotite, epidote, and various clay minerals.

From Textbooks • Jan. 1, 2015

A general separation can be made into an epidotic division characterized by an abundance of macroscopic epidote and a non-epidotic division with microscopic epidote.

From History and Comprehensive Description of Loudoun County, Virginia by Head, James William

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.