The colors of sillimanite

Mossbauer data and optical absorption spectra were used to determine the three principal colours of sillimanite: yellow, brown and blue. Apparently the coloration is the result of intervalence charge transfer; however, the intensity of the absorption bands is not correlated with either Fe or Ti cont...

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Bibliographic Details
Published in:The American mineralogist 1982-08, Vol.67 (7-8), p.749-761
Main Authors: Rossman, George R, Grew, Edward S, Dollase, W. A
Format: Article
Language:English
Subjects:
aluminosilicates
blue sillimanite
brown sillimanite
chemical composition
chromium
color
ferric iron
high-grade metamorphism
ions
iron
metals
metamorphism
mineral data
Mineralogy
minerals
Mossbauer spectra
natural materials
nesosilicates
optical properties
orthosilicates
silicates
sillimanite
spectra
yellow sillimanite
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Summary:Mossbauer data and optical absorption spectra were used to determine the three principal colours of sillimanite: yellow, brown and blue. Apparently the coloration is the result of intervalence charge transfer; however, the intensity of the absorption bands is not correlated with either Fe or Ti content.
ISSN:0003-004X
1945-3027