tremolite

A mineral, so called from Tremola, a valley in the Alps, where it was discovered. It is classed by Hauy with hornblend or amphibole, and called amphibole grammatite. It is of three kinds, asbestos, common, and glassy tremolite; all of a fibrous or radiated structure, and of a pearly color. Tremolite is a subspecies of straight edged augite.