Rocksday

Tremolite

A white to gray amphibole formed when dolomitic marble is metamorphosed.

Tremolite specimen
Photo: Didier Descouens, CC BY-SA 4.0, via Wikimedia Commons

How to identify tremolite

  • White to gray blades or fibers in marble.
  • Amphibole cleavage angles of about 56° and 124°.
  • Lavender variety (hexagonite) fluoresces.

Often confused with

Where it's found

  • Gouverneur, New York
  • Switzerland
  • Italy

Uses

Collector specimens. Fibrous tremolite is a form of asbestos.

Rock tumbling

Can be tumbled with care.

Did you know?

It's named after Val Tremola in Switzerland, where it was first described.

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