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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.

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.

Trapiche Tourmaline from Zambia

Thomas Hainschwang, Franck Notari, and Björn Anckar

Green tourmaline from north-western Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.

Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines

Paul B. Merkel and Christopher M. Breeding

The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.