Electronic absorption spectra of phosphate minerals with olivine-type structures: I. Members of the triphylite-lithiophilite series, Li-M1[6](M2[6]) (Fex2+Mn1-x2+)[PO4]

摘要

Electronic absorption spectra of the orthorhombic olivine-type phosphate minerals of the triphylite-lithiophilite series, Li-MI[6](M2[6]) (Fex2+Mn1-x2+)[PO4], were obtained on members with x(Fe) = 0.195 (p, rs), 0.326 (sc, ps), 0.500 (p, rs), 0.564 (sc, ps), 0.708 (sc, ps), 0.750 (p, rs). Polarized spectra, ps, were measured on properly oriented single crystal slabs. sc. while powder remission spectra, ps, were scanned on unoriented fine grained powders, p. In all cases, microscope-spectrometric methods were used.