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Tremolite
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Tremolite is a member of the group of silicate minerals with composition: Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. Tremolite forms by of sediments rich in dolomite and . Tremolite forms a series with and . Pure tremolite is creamy white, but the color grades to dark green with increasing content. It has a hardness on Mohs scale of 5 to 6. , one of the two minerals of the , is a green variety of tremolite.

The fibrous form of tremolite is one of the six recognised types of . This material is toxic, and inhaling the fibers can lead to , and both and peritoneal mesothelioma. Fibrous tremolite is sometimes found as a contaminant in , (itself a type of asbestos) and .


Occurrence
Tremolite is an indicator of metamorphic grade since at high temperatures it converts to .

Tremolite occurs as a result of contact metamorphism of calcium and magnesium rich siliceous and in greenschist facies metamorphic rocks derived from or magnesium . Associated minerals include , dolomite, , , , , , , and .

Tremolite was first described in 1789 for an occurrence in , Piumogna Valley, , (Tessin), .


Fibrous tremolite
One of the six recognized types of asbestos. Approximately 40,200 tons of tremolite asbestos is mined annually in India. It is otherwise found as a contaminant.


See also
  • Libby, Montana – location of asbestos-related ailments caused by tremolite

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