Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines
The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.
Liddicoatite Tourmaline from Anjanabonoina, Madagascar
Liddicoatite, a calcium-rich lithium tourmaline, was recognised as a separate mineral species in 1977, and named in honour of Richard T. Liddicoat.
Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink colour were examined for this report.
Mt. Mica: a renaissance in Maine’s gem tourmaline production
The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.
Gem-Bearing Pegmatites: A Review
A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and topaz.
The Elahera Gem Field in Central Sri Lanka
The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.
A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
Tourmaline as an Inclusion in Zambian Emeralds
A report on Zambian emeralds with tourmaline inclusions.
Interesting Red Tourmaline from Zambia
A new source of red tourmaline is identified in Zambia.
Gem-quality cuprian-elbaite tourmalines from São José Da Batalha, Paraíba, Brazil
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.