Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian


Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_420
Crocidolite is an asbestos mineral that can be used as a gem. It has a Mohs hardness of five and a specific gravity of 3.02–3.42 g/cm 3. It transforms into petrified wood when subject to SiO 2 metasomatism, and its hardness will increase to 7, but the specific gravity will decrease to 2.64–2.71. Crocidolite can be brownish yellow, reddish brown, grey blue or maroon, has a fine and tough texture, a fibrous structure and silky lustre. A beautiful cat’s eye effect can be achieved through parallel cutting. Therefore, it is a popular raw material for making blue asbestos cat’s eye gems (Fig. 55).
This is a preview of subscription content, log in to check access.

Copyright information

© Springer Nature Singapore Pte Ltd. 2020