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- Title
Treated violetish blue to violet quartz from Brazil.
- Authors
Güttler, Rainer Schultz; Kohigashi, Hisahiro Claudio
- Abstract
The article describes a treated violetish blue to violet quartz from Brazil. Blue quartz is very rare, and the color of nearly all such material is formed by mineral inclusion. Blue quartz features an orange tint when viewed in transmitted light because of the scattering by the minute particles. The variety of violetish blue to blue quartz has been formed through the heating and gamma irradiation of amethyst from a mine near Montezuma, in the Rio Pardo region in northern Minas Gerais. The deposit first became popular during the 1960s for amethyst could turn green through heating.
- Subjects
MINAS Gerais (Brazil); BRAZIL; QUARTZ; AMETHYSTS; OXIDE minerals; GEMS &; precious stones
- Publication
Gems & Gemology, 2006, Vol 42, Issue 4, p285
- ISSN
0016-626X
- Publication type
Article