Abstract
Raman spectra of mineral peretaite Ca(SbO) 4(OH) 2(SO 4) 2·2H 2O were studied, and related to the structure of the mineral. Raman bands observed at 978 and 980 cm −1 and a series of overlapping bands observed at 1060, 1092, 1115, 1142 and 1152 cm −1 are assigned to the SO 4 2− ν 1 symmetric and ν 3 antisymmetric stretching modes. Raman bands at 589 and 595 cm −1 are attributed to the SbO symmetric stretching vibrations. The low intensity Raman bands at 650 and 710 cm −1 may be attributed to SbO antisymmetric stretching modes. Raman bands at 610 cm −1 and at 417, 434 and 482 cm −1 are assigned to the SO 4 2− ν 4 and ν 2 bending modes, respectively. Raman bands at 337 and 373 cm −1 are assigned to O–Sb–O bending modes. Multiple Raman bands for both SO 4 2− and SbO stretching vibrations support the concept of the non-equivalence of these units in the peretaite structure.
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