Abstract: Natural grossular samples from Franklin, NJ Sierra de Cruces Range, Coahuila, Mexico, Asbestos, Canada and Africa (Mali) have been studied by laser-induced time-resolved luminescence techniques. The specific combinations of luminescence and excitation spectra together with luminescence decay times enabled their interpretation as Mn2+, Mn3+, Mn4+, V2+, Ni2+ and REE3+ emission centers. Such conclusions have been partly supported by luminescence study of artificial garnets activated by the corresponding potential emission centers.
Abstract: Visual luminescence of natural margarosanite, swedenborgite and walstromite is well known for mineralogists, but their spectral characteristics and interpretation were still missing. We studied those minerals by laser-induced time-resolved luminescence technique, described the corresponding spectral and kinetic parameters and interpreted the luminescence centers as follows: margarosanite - Mn2+, Mn2+ clusters, Pb2+ and Ce3+; swedenborgite - Sb3+; walstromite - Mn2+, Eu2+ and trivalent rare-earth elements.
Abstract: We have interpreted a number of luminescence centers in natural tugtupite Na8Al2Be2Si8O24Cl2, sodalite Na8Al6Si6O24C2 and hackmanite Na8Al6Si6O24(Cl2,S) by use of laser-induced time-resolved luminescence spectroscopy. The main new results are the following: Fe3+, Mn2+, Eu2+, Ce3+, mercury type (potentially Pb2+, Tl+, Sn2+ and/or Sb3+), radiation induced luminescence centers; several types of S2 − centers. Spectral shift connected with the presence of luminescence centers, which are detected together with S2 − centers and impossible to resolve with continuous wave luminescence spectroscopy, is the possible reason for spectral diversity of S2 − luminescence centers presented in different publications.
