Tremolite is found most frequently in metamorphosed dolomitic limestone. It was named by J.G.A. Hopfner for the Tremola Valley, Switzerland. A felted aggregate of tremolite fibers goes under the name of "mountain leather" or "mountain cork." The mineral frequently is fibrous and is the material to which the name "asbestos" was originally given.

Mineral Photos courtesy of R.Weller/Cochise College