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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  
/ 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.


Other Word Forms

Derived Forms

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

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

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

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

All these types are holocrystalline, and range in texture from coarse granite with augen an inch long down to a fine epidote granite with scarcely visible crystals.

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

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