A New Dyed Purple Opal

Nathan Renfro and Shane F. McClure

September 26, 2011

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Examination of a group of opals with an unusual bright purple bodycolor and strong play-of-color

Ongoing Research

Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of color origin, and the identification of synthetic and treated diamond melee.

Ren Lu

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Elise A. Skalwold, Nathan Renfro, Christopher M. Breeding, and Jim Shigley

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Al Gilbertson and Ilene Reinitz

Jun 13, 2012

Details the sapphire mining and trading situation at this newly discovered deposit, including descriptions of the area's geology and samples observed during the expedition.

Vincent Pardieu, Emily V. Dubinsky, Supharart Sangsawong, and Boris Chauviré

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A New Dyed Purple Opal

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