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Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

Opal from Queretaro, Mexico: Occurrence and Inclusions

John I. Koivula, Chuck Fryer, June 1, 1983

An examination of play-of-colour opal from Mexico and its variety of inclusions.

Chrysoprase and Prase Opal from Haneti, Central Tanzania

James E. Shigley, Brendan M. Laurs, and Nathan D. Renfro

Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.

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