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Heating experiments on amazonite

Published online by Cambridge University Press:  14 March 2018

Ivar Oftedal
Ivar Oftedal*
Affiliation:
Min. Inst., University of Oslo
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Summary

The rate of decolorization of a Norwegian amazonite was studied at various temperatures: near 500° C. it was almost instantaneous, becoming successively slower with lower temperatures, until at 300° C. no change was visible in 10 hours. It is concluded that the colour is stable indefinitely below about 270° C. and that this is the maximum temperature at which the colour could have appeared.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 236 , March 1957 , pp. 417 - 419
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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References

Literature on colour centra and defective structures

Hauffe, K. Reaktionen in und an festen Stoffen. Springer, Berlin, 1955.Google Scholar
Przibram, K. Verfarbung und Lumineszenz. Springer, Wien, 1953.Google Scholar