a type of clay sometimes used for fining wines, a white powdery material arising from the decomposition of feldspars in granites. Used in paper and pottery manufacture and as a filler in textiles and paint., puhas valkjas portselansavi, valge savi, mis koosneb pms kaoliniidist. Kaoliin on portselani ja fajansi asendamatu tooraine, teda tarvitatakse ka nt. alumiiniumi-, paberi-, keemia- ja parfümeeriatööstuses.