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A monoclinic clay mineral, a hydrated silicate of potassium and aluminium. It is dominant clay mineral in shales and mudstones. The illite group somewhat resembles muscovite.
illiit . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/illiit/1/est (01.07.2026)
