illite

[il-ahyt]
noun
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:
1937; ill(inois) + -ite1

illitic [ih-lit-ik] , adjective
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World English Dictionary
illite (ˈɪlaɪt)
 
n
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
 
[C20: named after Illinois, where it was first found]

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Encyclopedia Britannica
Encyclopedia

illite

any of a group of mica-type clay minerals widely distributed in marine shales and related sediments. Illite contains more water and less potassium than true micas, but it has a micalike sheet structure and is poorly crystallized. It may form a chemical series with both muscovite and montmorillonite; it is a weathering product of muscovite and alters to montmorillonite under humid conditions. For chemical formula and detailed structure and physical properties, see clay mineral (table); mica (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Dyna- illite only brought the remains of old shipwrecks to the surface.
Infiltration capacity seems to be influenced by the proportion of illite within the silt sized fraction.
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