Original paper

Optical absorption spectra of Mn3+ ions in vesuvianites from Lower Silesia, Poland

Platonov, Alexej N.; Żabiński, Witold; Sachanbiński, Michał

European Journal of Mineralogy Volume 7 Number 6 (1995), p. 1345 - 1352

31 references

published: Dec 27, 1995
manuscript accepted: Jun 6, 1995
manuscript received: Jun 15, 1994

DOI: 10.1127/ejm/7/6/1345

BibTeX file

ArtNo. ESP147050706007, Price: 29.00 €

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Abstract Lilac, yellow and pink, small crystals of manganese-bearing (up to 1.10 wt.%) vesuvianites from Lower Silesia, Poland, were studied by optical and IR spectroscopic methods. Absorption spectra of the lilac sample show an intense, broad band at 18500 cm-1 in the E⟂c-polarization and weak bands at 23 100 cm-1, 18500 cm-1 and 12500 cm-1 in the Ellc-polarization. The spectra of the yellow vesuvianites have a strong E II c-polarized band near 23600 cm-1 and weak bands at 23900 cm-1, 22700 cm-1 and 20100 cm-1 in the E II c-polarization. The spectra of the pink variety result from superposition of Mn3+-bands in the spectra of the lilac and yellow vesuvianites. It has been concluded that spectra of the yellow vesuvianite studied are due to Mn3+ ions occupying the fivefold-coordinated B-sites (C4V symmetry). The dominating absorption band 23600 cm-1 is assigned to the only symmetry-allowed transitions 5B1 ->5E in Mn3+ ions. The spectra of the lilac variety can be assigned to Mn3+ ions in the distorted AlFe-octahedra or also in B-sites, which have different B-Oio distances. The distribution of Mn3+ in non-equivalent structural positions of the vesuvianites studied may be the result of different temperatures of crystallization and of the state of ordering, which is supported by IR spectroscopic investigations


Mn-bearing vesuvianiteoptical absorption spectracolour of vesuvianiteIR spectra