Nomenclature
CAS number: 1302-78-9
Wilkinite.
Description and references
A colloidal native hydrated aluminum silicate
(clay) found in the midwest of the U.S.A. and in Canada. Consists
principally of montmorillonite, Al2O3.4SiO2.H2O. Usually contains some magnesium, iron, and
calcium carbonate. Review: J. Alexander, Ind. Eng. Chem. 16, 1140 (1924).
Properties
The color in the massive condition varies from
yellowish-white to almost black. The powder is cream colored to pale
brown. It has the property of forming highly viscous suspensions
or gels with not less than ten times its weight of water. The property
of forming gels is very much increased by the addition of small amounts
of alkaline substances such as magnesium oxide.Use
As of Fuller's earth; as emulsifier for oils; as
a base for plasters. Pharmaceutic aid (suspending agent).