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Green Tourmaline is a complex sodium lithium boro-aluminium silicate hydroxide in the Tourmaline group found in granites and granitic pegmatites. Green Tourmaline, known as Verdelite. Chemical Composition: Na(Li1.5,Al1.5)Al6S6O18(BO3)3(OH)4 - NaFe3(Al,Fe)6Si6O18(BO3)3(OH)4 Origin: Afghanistan, Brazil, Madagascar Finish: Natural Color: Green