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Purple to Reddish Purple Chrysoberyl from Brazil.
- Source :
- Journal of Gemmology; 2014, Vol. 34 Issue 1, p32-40, 9p
- Publication Year :
- 2014
-
Abstract
- Mineralogical and gemmological data of two intensely coloured chrysoberyls from Brazil are presented. Both samples are twinned, and they appear violet-purple or purple in daylight, and reddish purple or red-purple in incandescent light. They have good transparency, but appear very dark in reflected light due to their enriched chromium contents. In one sample, an average of 1.54 wt.% Cr<subscript>2</subscript>O<subscript>3</subscript> was measured, together with 0.60 wt.% Fe<subscript>2</subscript>O<subscript>3</subscript>. The high Cr content is responsible for a reduced transmission in the blue-green range of the visible spectrum, which causes a shift in the daylight coloration from blue-green for typical Cr-bearing chrysoberyl (alexandrite) to violet-purple or purple for such samples with distinctly higher Cr values. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13554565
- Volume :
- 34
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Gemmology
- Publication Type :
- Academic Journal
- Accession number :
- 97393057
- Full Text :
- https://doi.org/10.15506/jog.2014.34.1.32