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Amethyst from Boudi, Morocco

Fabrizio Troilo, Abdelghani El Harfi, Salahaddine Mouaddib, Erica Bittarello, and Emanuele Costa, April 30, 2015

An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.

Amethyst from Four Peaks, Arizona

Jack Lowell and John I. Koivula, September 1, 2004

For more than a century, the Four Peaks mine in Maricopa County, Arizona, has produced gem-quality amethyst.

Amethyst Mining in Brazil

David Stanley Epstein, December 1, 1988

Brazil is currently the leader in overall production of amethyst.

Amethystine Chalcedony

James E. Shigley and John I. Koivula, December 1, 1985

"Damsonite," the trade name for a new type of chalcedony, is analysed and described.

A Status Report on Gemstones from Afghanistan

Gary W. Bowersox, December 1, 1985

An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.

Artificially Induced Colour in Amethyst-Citrine Quartz

Kurt Nassau, March 1, 1981

A new and rather unusual gem material and possible treatments are discussed.