GIA has proven refined conditions necessitating quantitative chemical analyses to find out geographic origin for these tourmalines. These standards had been dependant on various hundred samples from recognised resources spanning the three international locations. Really exact and exact quantitative elemental concentrations for Cu, Zn, Ga, Sr, Sn, a

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Paraiba tourmaline from Mozambique From the late 1990s, copper-containing tourmaline was located in Nigeria. The fabric was commonly paler and fewer saturated as opposed to Brazilian resources, Even though the fabric normally was much less provided. A More moderen African discovery from Mozambique has also produced tourmaline coloured by copper, ju

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