Abstract
RECENT investigations1,2 have shown that the colour and paramagnetic resonance (PMR) centres of violet amethyst quartz are related to one another in a rather complex way. This communication reports paramagnetic resonance lines in both amethyst and citrine (which is related to amethyst by heat treatment) not analysed previously, and the behaviour of these lines with heat treatment.
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HUTTON, D., TROUP, G. Paramagnetic Resonance Centres in Amethyst and Citrine Quartz. Nature 211, 621 (1966). https://doi.org/10.1038/211621a0
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DOI: https://doi.org/10.1038/211621a0
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