Abstract
It is demonstrated that synthetic opals, like most natural ones, have a cristobalite rather than quartz basis, change their color from white to blue after losing their water-containing component, and form superlattices. Being affected by temperature and pressure, they undergo partial or complete crystallization to the corresponding polymorphic modifications.
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Original Russian Text © V.A. Somenkov, S.S. Agafonov, V.P. Glazkov, E.S. Kovalenko, M.N. Shushunov, 2015, published in Kristallografiya, 2015, Vol. 60, No. 1, pp. 39–41.
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Somenkov, V.A., Agafonov, S.S., Glazkov, V.P. et al. Study of the structure of synthetic opals affected by temperature and pressure. Crystallogr. Rep. 60, 34–36 (2015). https://doi.org/10.1134/S1063774515010216
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DOI: https://doi.org/10.1134/S1063774515010216