Anthophyllite is of a brownish colour, and glistening, pearly, pseudo-metallic lustre; it occurs massive, the mass consisting of crystals or crystalline fibres often disposed in a radiating form.
Amphibole mineral, a magnesium and iron silicate that occurs in altered rocks, such as the crystalline schists of Kongsberg, Norway; southern Greenland; and Pennsylvania. Anthophyllite is commonly produced by regional metamorphism of ultrabasic rocks (see acid and basic rocks)