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Excerpt from Elements of Mineralogy: Adapted to the Use of Seminaries and Private Students
This curious and beautiful property appears to depend on the structure of the mineral, and is possessed only by a few specie Ex. Precious Opal. This beautiful stone presents, -as it is turned in various directions towards the light, intense and playful changes of color, which proceed from the interior, presenting as it is turned,~ most of the colors of the rainbow.
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