Charakteristika turmalínů z albitové jednotky granitických pegmatitů žil č. 5 a č. 8 v Dolních Borech – HatíchČlánek v PDF
Characterization of tourmalines from albite unit of pegmatite dikes No. 5 and No. 8 at Dolní Bory – Hatě
Tourmaline crystals from albite units of pegmatite dikes No. 5 and No. 8 at Dolní Bory – Hatě were in vestigated by electron microprobe, LA-ICP-MS, and Mössbauer spectroscopy in order to get complete chemical characterization including Fe3+/Fetot, light, and trace elements contents. In transmitted light, tourmaline shows quite distinct core with a slight sector zoning which is overgrown by darker parts with oscillatory zoning and delta features. In some section of crystals, the core was not observed. The empirical formulae are characterized by 0.044–0.065 Fe3+/Fetot, high X-site vacancy (0.37–0.61 pfu), 1.57–1.64 apfu Fetot, low Mg (0.16–0.29 apfu) and elevated Al at the Y-site (0.69–1.01 apfu). Oxygen or the OH group dominates at W-site (0.44–0.69 and 0.20–0.42 apfu, respectively), whereas F is low (0.03–0.25 apfu). Based on these ionic ratios, the oxy-foitite>foitite>oxy-schorl are dominant endmembers in the tourmaline cores, whereas the oscilátory and delta features parts correspond to oxy-schorl to very rare schorl.
Eva Mrkusová, Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic; email: firstname.lastname@example.org
Radek Škoda, Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Jakub Haifler, Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Jan Filip, Czech Advanced Technology and Research Institute (CATRIN), Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
Markéta Holá, Department of Chemistry of the Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic