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Polarized absorption spectra of sellaite from the Brumado mine, Brazil, in the near infrared

BERAN, ANTON and ZEMANN, JOSEF, 1985: Polarized absorption spectra of sellaite from the Brumado mine, Brazil, in the near infrared. Bull. Geol. Soc. Finland 57, Part 1—2, 113—118. Polarized absorption spectra of sellaite from the Brumado mine, Brazil, were recorded in the region v = 1600—4000 c m ' (X = 6.25—2.50 ^m). Besides weak, non-pleochroic broad bands in the range of the H 2 0 bending and stretching vibrations — evidently caused by liquid inclusions — a sharp pleochroic band was observed at v = 3615 cm 1 . For this band the absorption is much stronger when the electric vector vibrates perpendicular to [001]; it is tentatively interpreted by a minor substitution of fluorine by hydroxyl groups.