LA-ICP-MS Analysis Profiles of Multicolored Tourmaline from Mozambique Sample No. GRS-Ref7782.
Fig. Par77 Photograph of a multi-colored tourmaline from Mozambique, Sample No. GRS-Ref3134. Violet, greenish-blue and green color zoning is present (from core to rim). Laser ablation craters are visible (size 60 micrometers). Chemical analysis profiles see Fig. Par78a-f.
Fig. Par78a Variations in Cu-, Mn and Bi- concentrationsConcentrations of Cu, Mn and Bi are shown in a profile across a Mozambique tourmaline. From the core to the rim the following chemical variations are observed: Cu-concentrations are high in the purple core. Abrupt increase in the violet to greenish-blue part of the crystal and decreasing concentrations towards the rim. Mn-concentrations are relatively high in the core and decrease towards the middle part of the tourmaline. In the rim, manganese values increase to their highest measured values. Bi-concentrations are high over the entire measured profile. Highest concentrations are found in the rim of the crystal. Lowest Bi concentrations are found along with low Mn-concentrations in the greenish-blue part of the crystal.
Fig. Par78a Variations in Mn/Cu-, Bi/Cu-and Pb/Be-ratiosHigh Mn/Cu-ratios are measured in the green colored rim. Lowest Mn/Cu-ratios are formed in the greenish-blue color zone. Bi/Cu-ratios continuously increase from the core to the rim. In the middle of the blue color zone, Bi/Cu-ratios are continuously increasing towards the rim. Highest Bi/Cu-ratios are found in the green rim. Pb/Be-ratios are well above 1 (Pb higher than Be). During the growth phase producing green colors, Be dominates Pb and therefore, Pb/Be-ratios are decreasing (Fig. Par78b).
LA-ICP-MS Analysis Profiles of Multicolored Tourmaline from Mozambique
