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WikiPedia: Tourmaline http://www.farlang.com/gemstones/tourmaline http://www.gggems.com/tourmaline_characteristics.h... http://webmineral.com/data/Elbaite.shtml http://www.geol.lsu.edu/henry/Research/tourmaline/... http://gemstone.org/education/gem-by-gem/122-tourm... http://www.mindat.org/min-4003.html https://www.lexico.com/definition/tourmaline https://www.gia.edu/tourmaline-history-lore https://web.archive.org/web/20051228163105/http://... https://commons.wikimedia.org/wiki/Category:Tourma...