Topaz, Aquamarine and Other Beryls from Klein Spitzkoppe, Namibia
This article presents, for the first time, both gemmological and geologic information on topaz, aquamarine and other beryls from miarolitic pegmatites at Namibia’s historic Klein Spitzkoppe mineral locality.
An Update on Imperial Topaz from the Capao Mine, Minas Gerais, Brazil
The Capao mine is one of the oldest and most productive fully mechanised Imperial topaz mines in the historic Ouro Preto area of Minas Gerais, Brazil.
Pink Topaz from Pakistan
Pakistan has begun to produce fine gem-quality pink topaz.
The Capão Topaz deposit, Ouro Preto, Minas Gerais, Brazil
This article examines the history of the Ouro Preto district as well as the geology of the area and occurrence of the topaz.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
Irradiated Topaz and Radioactivity
Large quantities of colourless topaz are currently being treated by gamma irradiation to turn them blue.