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illite

[ il-ahyt ]

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.

illite

/ ˈɪlaɪt /

noun

  1. a clay mineral of the mica group, found in shales and mudstones. Crystal structure: monoclinic. Formula: K 1–1.5 Al 4 (Si 6.5–7 Al 1–1.5 O 20 )(OH) 4

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Other Words From

  • il·lit·ic [ih-, lit, -ik], adjective

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Word History and Origins

Origin of illite1

First recorded in 1937; Ill(inois) 2( def ) + -ite 1

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Word History and Origins

Origin of illite1

C20: named after Illinois , where it was first found

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