Abstract

Five samples of blue, bluish green, and green Fe,Mg-enriched beryl from Li-poor granitic pegmatites [beryl-columbite (LCT) pegmatites at Kovářová and Boněnov in the Czech Republic and Val Sissone in Italy; a primitive pegmatite at Beryller, Untersulzbachtal, Austria; and a euxenite (NYF) pegmatite from the Beryl Pit, Quadeville, Ontario] were investigated using EMPA, Mössbauer spectroscopy, LA-ICP-MS, and powder XRD diffraction. The EMPA data show highly heterogeneous (Kovářová, Val Sissone) to rather homogeneous crystals (Boněnov, Beryller, Quadeville), with high variations in Al (1.51–1.91 apfu), Mg (0.01–0.31), Fetot (0.01–0.18), and Na (0.04–0.37). The substitution CH□ + OR3+CHR+ + OR2+ is dominant and supported by the powder XRD data. LA-ICP-MS revealed notable concentrations of some trace elements: Cs ≤ 7568 ppm (Kovářová), Li ≤ 928 ppm (Quadeville), Sc ≤ 2823 ppm (Val Sissone). Beryl samples have mostly comparable contents of Fe3+, ~ 25% at the O-site, but differ in the presence of Fe2+ at the T(2)-site. Primitive characteristics of some examined beryl (Mg/(Mg+Fetot) = 0.37–0.68 reflect low degree of fractionation of the host pegmatite (Beryller), or high degree of Mg-contamination from host metabasites in the pegmatite dikes (Kovářová, Boněnov). The concentrations and ratios of selected elements, including Fe3+/Fe2+, in beryl from these Li-poor pegmatites are not feasible for any implications of pegmatite-family affinity or degree of its fractionation except for Li; however, no evident correlation between Li and Cs contents was found.

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