Chemical composition and species attribution of tourmalines from a rare-metal pegmatite vein with scapolite (Sangilene Highlands, Tuva)
- Autor(en)
- L.G. Kuznetsova, A.A. Zolotarev, O.V. Frank-Kamenetskaya, I.V. Rozhdestvenskaya, Yu.M. Bronzova, J. Spratt, Andreas Ertl
- Abstrakt
Detail study of chem. compn. and regularities in isomorphic replacement in tourmalines from the scapolite-bearing rare-metal pegmatite body in basin of the Solbelder River has shown that these tourmalines are calcium ones, and their species belonging is detd. by occupation of the Y octahedral position. Compn. of the yellow tourmaline, most widespread in central parts of pegmatite body, is rather const. for characterizing by the ideal formula Ca(Mg2Li)Al6(Si6O18)(BO3)3(OH)3F. Variations in chem. compn. of zonal tourmaline crystals from the endocontact part of the pegmatite body testify to sharp change of chem. media during their formation process. Central - yellow zones of these crystals are close by compn. to tourmaline in central part of the body, but then there is sharp decrease of the Mg content: Mg2+ Fe2+, 2Mg2+ Li+ + Al3+ and Mg2+ + OH- Al3+ + O2-. Compn. of dark-green edge parts of tourmalines may be characterized by the ideal formula Ca(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH2O)(F). Obtained results indicate the specific conditions of the pegmatite-forming. Crystal-chem. formulas of studied tourmalines, confirmed by structural data, allow to consider them as the new species in the tourmalines group.
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Russian Academy of Sciences, Saint Petersburg State University, Natural History Museum London
- Journal
- Proceedings of the Russian Mineralogical Society
- Band
- 140
- Seiten
- 102-116
- Anzahl der Seiten
- 15
- ISSN
- 0869-6055
- Publikationsdatum
- 2011
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105116 Mineralogie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/cc326a58-87da-4f50-8b40-2dee8d4a0268