title: Microscopy and Cathodoluminescence Spectroscopy Characterization of Quartz Exhibiting Different Alkali-Silica Reaction Potential.
abstract: Different quartz types from several localities in the Czech Republic and Sweden were examined by polarizing microscopy combined with cathodoluminescence (CL) microscopy, spectroscopy, and petrographic image analysis, and tested by use of an accelerated mortar bar test (following ASTM C1260). The highest alkali-silica reaction potential was indicated by very fine-grained chert, containing significant amounts of fine-grained to cryptocrystalline matrix. The chert exhibited a dark red CL emission band at ~640 nm with a low intensity. Fine-grained orthoquartzites, as well as fine-grained metamorphic vein quartz, separated from phyllite exhibited medium expansion values. The orthoquartzites showed various CL of quartz grains, from blue through violet, red, and brown. Two CL spectral bands at ~450 and ~630 nm, with various intensities, were detected. The quartz from phyllite displayed an inhomogeneous dark red CL with two CL spectral bands of low intensities at ~460 and ~640 nm. The massive coarse-grained pegmatite quartz from pegmatite was assessed to be nonreactive and displayed a typical short-lived blue CL (~480 nm). The higher reactivity of the fine-grained hydrothermal quartz may be connected with high concentrations of defect centers, and probably with amorphized micro-regions in the quartz, respectively; indicated by a yellow CL emission (~570 nm).
authors.affiliation: 1Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science,Charles University in Prague,Albertov 6,128 43 Praha,Czech Republic.
authors.forename: Aneta
authors.initials: A
authors.lastname: Kuchařová
authors.affiliation: 2TU Bergakademie Freiberg,Institute of Mineralogy,Brennhausgasse 14,D-09596 Freiberg,Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Götze
authors.affiliation: 1Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science,Charles University in Prague,Albertov 6,128 43 Praha,Czech Republic.
authors.forename: Šárka
authors.initials: Š
authors.lastname: Šachlová
authors.affiliation: 1Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science,Charles University in Prague,Albertov 6,128 43 Praha,Czech Republic.
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Pertold
authors.affiliation: 1Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science,Charles University in Prague,Albertov 6,128 43 Praha,Czech Republic.
authors.forename: Richard
authors.initials: R
authors.lastname: Přikryl
mesh_terms: D000468:Alkalies / Q000032:analysis*; D018153:Czech Republic; D008859:Microscopy, Polarization; D011791:Quartz / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis*; D013057:Spectrum Analysis; D013548:Sweden
chemical_list: D000468:Alkalies; D011791:Quartz; D012822:Silicon Dioxide
keywords: CL microscopy; alkali–silica reaction; image analysis; quartz