Polarized optical absorption spectra and laser-excited luminescence spectra have been measured on single-crystal Fe-rich orthoclase. The absorption spectrum consists of a series of sharp, weak bands that can be assigned to spin-forbidden crystal-field transitions of Fe3+ substituted on the tetrahedral Al3+ site of the feldspar structure. A broad-band luminescence in the deep-red region is the Stokes-shifted 4T16A1 transition of tetrahedral Fe3+ and confirms the assignments of the absorption spectrum. The temperature dependence of the luminescence intensity can be accounted for by a phonon-assisted nonradiative decay process.

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