Tremolite

What is Tremolite?

Tremolite is a type of mineral that belongs to the amphibole group. It is made up of calcium, magnesium, iron, and oxygen. It forms when certain rocks change under high pressure and temperature.

Tremolite can look like clear or creamy-white crystals, but it can also turn dark green when it contains more iron.

A Special Form: Nephrite

One special form of tremolite is called nephrite. This is a type of jade, a precious gemstone that has been used for thousands of years in jewelry and art.

A Safety Note

There is an important safety note about tremolite. When it grows in thin, fiber-like shapes, it becomes a type of asbestos. Breathing in these tiny fibers can be harmful to the lungs. Because of this, it is important to handle materials that may contain this form of tremolite with great care.

Occurrence

Tremolite shows how hot things can get during rock changes because it turns into another mineral at high temperatures.

Tremolite forms when certain kinds of rocks change under heat and pressure. It comes from rocks that have calcium and magnesium mixed with silicon. Other minerals often found with it include calcite, dolomite, grossular, wollastonite, talc, diopside, forsterite, cummingtonite, riebeckite, and winchite.

Tremolite was first found in 1789 in a place called Campolungo in the Piumogna Valley, in Leventina, Ticino (also called Tessin), Switzerland.

Fibrous tremolite

Fibrous tremolite is one of the six types of asbestos. It is mined each year in India. It can also be found in other materials.