cordierite

[kawr-dee-uh-rahyt]
noun
a strongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks.
Also called dichroite, iolite.


Origin:
1805–15; named after Pierre L. A. Cordier (1777–1861), French geologist; see -ite1

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World English Dictionary
cordierite (ˈkɔːdɪəˌraɪt)
 
n
dichroite, Also called: iolite a grey or violet-blue dichroic mineral that consists of magnesium aluminium iron silicate in orthorhombic crystalline form and is found in metamorphic rocks. Formula: (Mg,Fe)2AL4Si5O18.nH2O
 
[C19: named after Pierre L. A. Cordier (1777--1861), French geologist who described it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cordierite   (kôr'dē-ə-rīt')  Pronunciation Key 
A light-blue to dark-blue or gray orthorhombic mineral. Cordierite is a silicate of magnesium, aluminum, and sometimes iron, and is found in granites and in metamorphic rocks that form under relatively low-pressure conditions. Chemical formula: (Mg,Fe)2Al4Si5O18.
The American Heritage® Science Dictionary
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Encyclopedia Britannica
Encyclopedia

cordierite

blue silicate mineral that occurs as crystals or grains in igneous rocks. It typically occurs in thermally altered clay-rich sediments surrounding igneous intrusions and in schists and paragneisses. Precambrian deposits of the Laramie Range, Wyo., U.S., contain more than 500,000 tons of cordierite. Cordierite is sometimes called dichroite because of its marked pleochroism (different coloured light is transmitted in different directions). For chemical formula and detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Red mudstone is typically altered to indurated, bluish-gray hornfels with clots or crystals of tourmaline or cordierite.
Cordierite and anthophyllite in footwall of metamorphosed deposits, graphitic schist in hanging wall.
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