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illite

[il-ahyt] /ˈɪl aɪt/
noun
1.
any of a group of clay minerals, hydrous potassium aluminosilicates, characterized by a three-layer micalike structure and a gray, light green, or yellowish-brown color.
Origin of illite
1937
First recorded in 1937; Ill(inois)2 + -ite1
Related forms
illitic
[ih-lit-ik] /ɪˈlɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for illite

illite

/ˈɪlaɪt/
noun
1.
a clay mineral of the mica group, found in shales and mudstones. Crystal structure: monoclinic. Formula: K1–1.5Al4(Si6.5–7Al1–1.5O20)(OH)4
Word Origin
C20: named after Illinois, where it was first found
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
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