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Unstable Radiation-Induced Yellow-Green Color in Grossular Garnet

Nassau, Kurt and Rossman, George R. and Wood, Darwin L. (1992) Unstable Radiation-Induced Yellow-Green Color in Grossular Garnet. Gems and Gemology, 28 (3). pp. 188-191. ISSN 0016-626X.

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Although conventional wisdom has been that irradiation will not alter the color of garnets, exposure of some colorless to pale-hued African grossulars to either ^(60)Co or ^(137) Cs gamma rays turns them light yellow-green. The resulting color is unstable and fades within hours to days in sunlight, and within weeks in the dark. The spectra of the radiation-enhanced garnets differ from those of similar-appearing naturally colored grossulars. In the dark, the irradiation-related absorption features undergo two stages of fading: an initial period of relatively rapid fading, followed by a longer period of slow fading. In daylight, a single rate of even faster fading is observed.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1992 Gemological Institute of America. The authors are grateful to the following for supplying material for this study: Gene Dente of the Serengeti Co., San Diego, California, on whose specimens this phenomenon was first observed; Peter Flusser of Overland Gems, Los Angeles, California; H. Lind Edelsteinschleiferei, Idar-Oberstein, Germany; The Royal Ontario Museum, Toronto, Ontario, Canada; and the Gemological Institute of America, Santa Monica, California.
Issue or Number:3
Record Number:CaltechAUTHORS:20130607-111032586
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38853
Deposited By: Tony Diaz
Deposited On:25 Jun 2013 17:10
Last Modified:03 Oct 2019 05:01

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