illitic

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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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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