@article{ErtlGiesterSchuessleretal.2013,
  author    = {Ertl, Andreas and Giester, Gerald and Sch{\"u}ssler, Ulrich and Br{\"a}tz, Helene and Okrusch, Martin and Tillmanns, Ekkehart and Bank, Hermann},
  title     = {Cu- and Mn-bearing tourmalines from Brazil and Mozambique: crystal structures, chemistry and correlations},
  series = {Mineralogy and Petrology},
  volume    = {107},
  journal   = {Mineralogy and Petrology},
  number    = {2},
  doi       = {10.1007/s00710-012-0234-6},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-127296},
  pages     = {265-279},
  year      = {2013},
  abstract  = {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 <Y-O> distances and the (Li + Mn\(^{2+}\) + Cu + Fe\(^{2+}\)) content (apfu) at this site with R\(^2\) = 0.90. An excellent negative correlation exists between the <Y-O> distances and the Al\(_2\)O\(_3\) content (R\(^2\) = 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.},
  language  = {en}
}