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concentrations of Ti, Fe and Zn (Fig. Par66b), Th, U (Fig. Par66f) and Mg (Fig. Par66c) were detected at particular growth stages of the crystal. Fe, Ti and Zn increase towards the rim of the crystal (Fig. Par66b). Pb- and Be-concentrations remain constant along the measured profile at low levels (Fig. Par66d).
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Fig. Par65 A spectacular unheated copper-bearing tourmaline from Brazil (P. Wild, Quintos mine, Rio Grande do Norte). Size: 378.65ct, length= 52mm and width= 36mm.
Note the violet-blue color in the center of the crystal, followed by a “neon”-blue color of the main part and a green rim.
The tourmaline fragment that has been measured by LA-ICP-MS is from another sample that showed a more distinct color zoning developed over a shorter distance (Fig. Par64).
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LA-ICP-MS Chemical Analysis Profiles of “Paraiba”-Tourmaline, Rio Grande Do Norte
Quintos Mine (P. Wild), Sample No. GRS-Ref2079
