Charakteristika turmalínů z albitové jednotky granitických pegmatitů žil č. 5 a č. 8 v Dolních Borech – Hatích
| Title in English | Characterization of tourmalines from albite unit of pegmatite dikes No. 5 and No. 8 at Dolní Bory – Hatě |
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| Authors | |
| Year of publication | 2023 |
| Type | Article in Periodical |
| Magazine / Source | Acta Mus. Moraviae, Sci. geol. |
| MU Faculty or unit | |
| Citation | |
| Web | http://scigeo.actamm.cz/wp-content/uploads/2023/05/1_Skoda_Mrkusova.pdf |
| Keywords | Czech Republic; Dolní Bory – Hatě; EPMA; foitite; LA-ICP-MS; Mössbauer spectroscopy; oxy-foitite; oxy-schorl; pegmatite; tourmaline |
| Description | Tourmaline crystals from albite units of pegmatite dikes No. 5 and No. 8 at Dolní Bory – Hatě were in vesti - gated 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 oscillatory and delta features parts correspond to oxy-schorl to very rare schorl. |
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