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illite
illite (ˈɪlaɪt) n (Minerals) 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]il•lite (ˈɪl aɪt)
n. 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. [1937; Ill(inois) + -ite1] il•lit•ic (ɪˈlɪt ɪk) adj. illite
illite[′i‚līt] (mineralogy) A group of gray, green, or yellowish-brown micalike clay minerals found in argillaceous sediments; intermediate in composition and structure between montmorillonite and muscovite. illiteA clay mineral, a hydrous silicate of potassium, aluminum, iron, and magnesium; swells considerably on wetting and shrinks proportionately on drying. |