Hydrothermal precious opals of the Raduzhnoe deposit,north Primorye: The nature of the opalescence |
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| Authors: | S V Vysotskiy N G Galkin A V Barkar E A Chusovitin A A Karabtsov |
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| Institution: | 1.Far East Geological Institute, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia;2.Institute of Automatics and Management Processes, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia |
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| Abstract: | This paper reports the results of the study of hydrothermal precious opals. It was established that, in terms of their nanostructure
and formation conditions, the hydrothermal opals differ from exogenic precious opals. They are made up of small globules and
do not show any structuring of their nanoparticles on the basis of closest packing, which is typical of exogenic precious
opals. During their formation, these opals were subjected to pneumatolytic annealing—they experienced the impact of a high-temperature
vapor under elevated pressure. The influence of the thermal effect led to the formation of two-dimensional photonic band gaps
in the chaotic opal matrix. These bands are composed of sheets whose cells were formed owing to the thermal effects according
to the principle of “Benard cells.” Precisely these structured blocks and thin films are responsible for the spectral dispersion
of light and iridescence. |
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