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- Title
THE CAUSE OF IRIDESCENCE IN RAINBOW ANDRADITE FROM NARA, JAPAN.
- Authors
Hainschwang, Thomas; Notari, Franck
- Abstract
"Rainbow" andradite from Nara, Japan, occurs as relatively small orangy brown crystals that show attractive iridescence in almost the entire range of the spectrum. The material is nearly pure andradite, as determined by its chemical composition and Vis-NIR and specular reflectance FTIR spectra. Microscopy revealed that two different types of lamellar structures appear to be responsible for the iridescent colors. These lamellar structures cause predominantly thin-film interference and most likely diffraction of light. The terms interference and diffraction are explained and correlated to the structure and iridescence observed in these garnets.
- Subjects
JAPAN; IRIDESCENCE; GEMS &; precious stones; CRYSTALS; STRUCTURAL colors; DECORATION &; ornament
- Publication
Gems & Gemology, 2006, Vol 42, Issue 4, p248
- ISSN
0016-626X
- Publication type
Article
- DOI
10.5741/GEMS.42.4.248