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We present the first single-crystal Raman spectra of the mineral schafarzikite FeSb 2 O 4  from the Pernek locality of the Slovak Republic. In addition, Raman spectra of the natural mineral apuanite Fe 2+ Fe 4  3+ Sb 4 O 12 S, originating from the Apuan Alps in Italy, as well as spectra of synthetic ZnSb 2 O 4  and the arsenite mineral trippkeite (CuAs 2 O 4 ) are presented for the first time. The spectra of the antimonite minerals are characterized by a strong band in the region 660-680 cm -1  with shoulders on either side, and a band of medium intensity near 300 cm -1 . The spectrum of the arsenite mineral is characterized by a medium band near 780 cm -1  with a shoulder on the high wavenumber side and a strong band at 370 cm -1 . Mode assignments are proposed based on the spectral comparison between the compounds, symmetry modes of the bands and prior literature. The single-crystal spectra of schafarzikite showed good mode separation, allowing bands to be assigned to the symmetry species of A 1g , B 1g , B 2g , or E g .

Single-crystal Raman spectroscopy of natural schafarzikite FeSb 2 O 4 from Pernek, Slovak Republic