. "Illite-clay"@en . "Illite-clay"@en . "stable"@en . "Illite-clay - A type of monomineralic aluminium-silicate sediment in which the aluminium-silicate mineral is illite. It is the unlithified equivalent of illite-claystone. British Geological Survey Research Report RR/99/03, section 9.1 and table 19."@en . . . "ILLCLY"@en . . .