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Opal from the Shewa Province, Ethiopia

Mary L. Johnson, Robert C. Kammerling, June 1, 1996

Opal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.

Green Opal From East Africa

John I. Koivula and C. W. Fryer, December 1, 1984

Gemmological and chemical analysis of bright green gem-quality opal from Tanzania.

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.

Play-of-colour opal from Wegel Tena, Wollo Province, Ethiopia

Benjamin Rondeau, et al.

A new opal deposit was discovered in 2008 near the village of Wegel Tena, in the volcanic rocks of Ethiopia’s Wollo Province.

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