A classification for sedimentary kaolinitic formations of economic importance

A wide range of sedimentary geological formations of which kaolin is a major constituent are used industrially for a wide range of uses, ranging from paper to ceramics. All these formations are of fresh water origin and can be looked at as a continuous series ranging from ball clays with high strength and plasticity at one end of the series to sedimentary kaolins with good powder brightness and rheology at the other end. The changes in commercial characteristics from one end of the series to the other can be related to the mineralogy of the sediments