Abstract
The occurrence of the amethyst-citrine dichromatism in natural and mainly synthetic quartz crystals was studied as a function of their growth conditions. It has been found experimentally that the origin of the coloration is related to the variable dependence of the incorporation of the amethyst- and citrine-producing impurities on the crystallographic direction and growth rates of the faces and also to the effect the charge compensators have on the thermal stability of the amethyst color centers.
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Balitsky, V.S., Balitskaya, O.V. The amethyst-citrine dichromatism in quartz and its origin. Phys Chem Minerals 13, 415–421 (1986). https://doi.org/10.1007/BF00309187
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DOI: https://doi.org/10.1007/BF00309187