Cu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally investigated samples show a pronounced positive correlation between the distances and the (Li + Mn2+ + Cu + Fe2+) content (apfu) at this site with R2 = 0.90. An excellent negative correlation exists between the distances and the Al2O3 content (R2 = 0.94). The samples at each locality generally show a strong negative correlation between the X-site vacancies and the (MnO + FeO) content. The Mn content in these tourmalines depends on the availability of Mn, on the formation temperature, as well as on stereochemical constraints. Because of a very weak correlation between MnO and CuO we believe that the Cu content in tourmaline is essentially dependent on the availability of Cu and on stereochemical constraints.

中文翻译：

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来自巴西和莫桑比克的含铜和锰的碧玺：晶体结构、化学和相关性

来自巴西和莫桑比克的含铜和锰的碧玺通过化学（EMPA 和 LA-ICP-MS）和 X 射线单晶结构细化进行了表征。所有这些样品都富含 Al、Li 和 F（氟橡胶），并含有大量的 CuO（高达 ~1.8 wt%）和 MnO（高达 ~3.5 wt%）。结构研究的样品显示距离与该位置的 (Li + Mn2+ + Cu + Fe2+) 含量 (apfu) 之间显着正相关，R2 = 0.90。距离和 Al2O3 含量之间存在极好的负相关 (R2 = 0.94)。每个位置的样品通常显示出 X 位空位与 (MnO + FeO) 含量之间的强烈负相关。这些电气石中的 Mn 含量取决于 Mn 的可用性、形成温度以及立体化学约束。