Tags: Chemical Substance, Mineral.
Pyrophyllite is a phyllosilicate mineral composed of aluminium silicate hydroxide: Al2Si4O10(OH)2. It occurs in two more or less distinct varieties namely as crystalline folia and as compact masses; distinct crystals are not known.The folia have a pronounced pearly lustre owing to the presence of a perfect cleavage parallel to their surfaces: they are flexible but not elastic and are usually arranged radially in fan-like or spherical groups.
