Micro-Features of Opal Chart
32" x 20" (80 x 50 cm)
This wall chart contains superbly detailed photomicrographs showing internal features observed in natural, treated, synthetic, and imitation opal. Published in the Summer 2019 issue with the article by Nathan D. Renfro et al., "Inclusions in Natural, Treated, Synthetic, and Imitation Opal," Gems & Gemology, Vol. 55, No. 2, pp. 244-245.
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