Study of the structure of synthetic opals affected by temperature and pressure
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- Somenkov, V.A., Agafonov, S.S., Glazkov, V.P. et al. Crystallogr. Rep. (2015) 60: 34. doi:10.1134/S1063774515010216
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.