Color Center in Amethyst Quartz
- 20 May 1966
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 152 (3725) , 1061-1062
- https://doi.org/10.1126/science.152.3725.1061
Abstract
Treatment with x-rays increased the intensity of color of natural amethyst up to fivefold, and an electron paramagnetic resonance spectrum was detected. The intensity of the spectrum was proportional to the intensity of the optical absorption near 545 mμ. The EPR spectrum of the color center corresponded to a positive hole trapped on a substitutional Fe 3+ ion in the quartz structure. We ascribe the color to a charge-transfer transition, Fe 4+ + O 2 — → Fe 3+ + O 1- .Keywords
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