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Fig. Par64 Photograph of multi-colored tourmaline from Brazil Rio Grande do Norte, Quintos mine (P. Wild), sample GRS- Ref 2079. Note: Violet, blue and green color zoning (from core to rim). Laser ablation craters are visible (size 60 micrometers). Chemical analysis profiles see Fig. Par66a-j.
Chemical analysis profile of “Paraiba”-tourmaline from Brazil (Sample No. GRS-Ref2079, GRS collection. Chemical variations are correlated with the color zoning (see Fig. Par66a-j).
Fig. Par66a. Variations of Cu-, Bi- and Mn-concentrations. The concentrations of Cu and Mn gradually change over the measured profile (Fig. Par66a). Higher concentrations of Cu than Mn were found in the core of the crystal (Cu/Mn-ratio is greater than 1). In the rim of the crystal, the Cu/Mn-ratio is less than 1.
Fig. Par66b-j Variations in REE-, Ta-, Nb-, Ti-, Fe-, Zn-, U-, Th- and Mg-concentrations From the core towards the rim, other element concentrations also increase, such as rare earth element La and Ce (Fig. Par66i and Fig.66j). A decrease in element concentrations over the same profile is observed for Ta and Nb (Fig. Par66e, g) and Ge (Fig. Par66h). Isolated increase of higher element
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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
