The tremolite fibers form a felted mass that has all the appearances and feel of a piece of cloth. The mountain leather will even have attached calcite crystals that seem to be knitted in to the fabric. Tremolite is an important temperature indicator for petrologists. CaMgSi 2 O 6 . The presence of only tremolite and no diopside indicates that the rock has not endured terribly high temperatures.
Tremolite can be a fun and very interesting mineral to collect.
Color is usually white or gray but can be greenish, colorless, yellow and violet. Luster is vitreous or silky to dull. Specimens are translucent to transparent. Fibrous crystals form radial aggregates, masses and hair like clusters. Fracture is uneven.