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Mt. Mica: a renaissance in Maine’s gem tourmaline production

William B. (Skip) Simmons, et al., June 1, 2005

The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.

Gem-quality cuprian-elbaite tourmalines from São José Da Batalha, Paraíba, Brazil

Emmanuel Fritsch, James E. Shigley, September 1, 1990

Unusually vivid tourmalines from the state of Paraiba, in north-eastern Brazil, have attracted great interest since they first appeared on the international gem market in 1989.

The Elahera Gem Field in Central Sri Lanka

Mahinda Gunawardene and Mahinda S. Rupasinghe, June 1, 1986

The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.

Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Governador Valadares District

Keith Proctor, June 1, 1985

A further article exploring tourmaline mines in another part of Minas Gerais.

Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

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