Clay from the Fuller's Earth formation is shown to contain mainly illite, kaolinite and calcite, in contrast to the Fuller's Earth bed in which montmorillonite is the main clay mineral. A negative correlation exists between the calcite content and the plasticity as measured by the Atterberg limits. Fresh samples from the Fuller's Earth bed have a higher plasticity than those of the fuller's earth clay with similar calcite percentages, due to the relative increases in the expanding-lattice clay mineral. Weathering of the fuller's earth clay typically reduces the calcite content and increases the percentage of montmorillonite, resulting in a higher plasticity.-D.J.M.
|Number of pages||18|
|Journal||Clays and Clay Minerals|
|Publication status||Published - 1986|