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- Title
Star and cat's-eye topaz from Brazil.
- Authors
Hyršl, Jaroslav
- Abstract
The article presents a description of a star and cat's eye topaz obtained in Brazil in August 2005. Standard gemological methods identified the egg-like cabochon, which is 333.27 carat, as a topaz. It was noted that semiparallel flat, hollow channels make up the inside of the topaz. It was found that growth phenomenon and not etching caused the creation of the hollow channels. Two rays are produced by the topaz when illuminated using a spotlight. Asterism in the topaz was caused by the striations.
- Subjects
BRAZIL; TOPAZ; GEMS &; precious stones; SILICATE minerals; ASTERISM (Crystallography); MINERALOGY; OPTICAL reflection
- Publication
Gems & Gemology, 2008, Vol 44, Issue 2, p182
- ISSN
0016-626X
- Publication type
Article