. . "50" . . . . "RIV/61989592:15310/12:33141928" . "0008-4476" . . . "4" . . "18"^^ . "RIV/61989592:15310/12:33141928!RIV13-MSM-15310___" . . "5"^^ . . . "Compositional evolution of zoned tourmaline crystals from pockets in common pegmatites of the Moldanubian zone, Czech Republic" . . "000314174400010" . . "15310" . . "Compositional evolution of zoned tourmaline crystals from pockets in common pegmatites of the Moldanubian zone, Czech Republic"@en . "Gadas, Petr" . . "10.3749/canmin.50.4.895" . "[F8CA33EEBCFC]" . . . "Canadian Mineralogist" . . . "Va\u0161inov\u00E1 - Galiov\u00E1, Michaela" . "Common pegmatites with pockets lined with crystals of smoky quartz, feldspars, muscovite, and black tourmaline commonly occur in migmatized biotite-sillimanite gneisses and felsic granulites of the Str\u00E1\u017Eek Unit, Moldanubian Zone, in the Czech Republic. Mostly concordant dikes or irregular bodies (0.1-2 m thick) consisting of an outer granitic unit, a graphic unit and a pocket unit with large crystals (up to 1 m long) of minerals show transitional to locally sharp contacts to the host migmatized rocks. Thin muscovite-rich veins, 1-10 cm thick, with the assemblage muscovite ? albite, quartz and tourmaline are closely associated spatially. Variable prismatic to lens-shaped tourmaline crystals and their aggregates, up to 30 cm across, from pockets and muscovite-rich veins exhibit striking zoning in the optical microscope (distinct colors and pleochroism) and in BSE images: core (foitite - schorl - magnesio-foitite), intermediate zone (schorl - dravite) and narrow outer rim (schorl - dravite); tourmaline from muscovite veins is relatively homogeneous (dravite - magnesio-foitite). A slight decrease in X-site vacancy, in Fetot/(Fetot + Mg) and Al contents but sharp increase of Ti from the core to intermediate zone and outer rim, respectively, are typical. Also, the LA-ICP-MS study of a single crystal of tourmaline from a pocket demonstrates a very similar chemical composition of core and intermediate zone, but a distinct composition of outer rim; Mn, Ni, Zn, Sc and Ga decrease, and V, Cr, Co and Sr increase in the rim. Nearly all Fe was determined as Fe2+ ({3% of Fe3+ in both core and intermediate zones of the tourmaline) using M\u00F6ssbauer spectroscopy." . "128238" . . "Compositional evolution of zoned tourmaline crystals from pockets in common pegmatites of the Moldanubian zone, Czech Republic" . "Stan\u011Bk, Josef" . "CA - Kanada" . . . . "Filip, Jan" . "Nov\u00E1k, Milan" . "foitite, schorl, dravite, magnesio-foitite, compositional evolution, zoning, pocket, common pegmatite, Moldanubian Zone, Czech Republic"@en . "P(ED2.1.00/03.0058), P(GAP210/10/0743), Z(MSM0021622412)" . "Common pegmatites with pockets lined with crystals of smoky quartz, feldspars, muscovite, and black tourmaline commonly occur in migmatized biotite-sillimanite gneisses and felsic granulites of the Str\u00E1\u017Eek Unit, Moldanubian Zone, in the Czech Republic. Mostly concordant dikes or irregular bodies (0.1-2 m thick) consisting of an outer granitic unit, a graphic unit and a pocket unit with large crystals (up to 1 m long) of minerals show transitional to locally sharp contacts to the host migmatized rocks. Thin muscovite-rich veins, 1-10 cm thick, with the assemblage muscovite ? albite, quartz and tourmaline are closely associated spatially. Variable prismatic to lens-shaped tourmaline crystals and their aggregates, up to 30 cm across, from pockets and muscovite-rich veins exhibit striking zoning in the optical microscope (distinct colors and pleochroism) and in BSE images: core (foitite - schorl - magnesio-foitite), intermediate zone (schorl - dravite) and narrow outer rim (schorl - dravite); tourmaline from muscovite veins is relatively homogeneous (dravite - magnesio-foitite). A slight decrease in X-site vacancy, in Fetot/(Fetot + Mg) and Al contents but sharp increase of Ti from the core to intermediate zone and outer rim, respectively, are typical. Also, the LA-ICP-MS study of a single crystal of tourmaline from a pocket demonstrates a very similar chemical composition of core and intermediate zone, but a distinct composition of outer rim; Mn, Ni, Zn, Sc and Ga decrease, and V, Cr, Co and Sr increase in the rim. Nearly all Fe was determined as Fe2+ ({3% of Fe3+ in both core and intermediate zones of the tourmaline) using M\u00F6ssbauer spectroscopy."@en . "Compositional evolution of zoned tourmaline crystals from pockets in common pegmatites of the Moldanubian zone, Czech Republic"@en . . . "1"^^ . .