Abstract
The structure of the borate mineral sakhaite Ca12Mg4(BO3)7(CO3)4Cl(OH)2·H2O, a borate–carbonate of calcium and magnesium has been assessed using vibrational spectroscopy. Assignment of bands is undertaken by comparison with the data from other published results. Intense Raman band at 1134cm−1 with a shoulder at 1123cm−1 is assigned to the CO32- symmetric stretching mode. The Raman spectrum displays bands at 1479, 1524 and 1560cm−1 which are assigned to the CO32- antisymmetric stretching vibrations. The observation of multiple carbonate stretching bands supports the concept that the carbonate units are non-equivalent. The Raman band at 968cm−1 with a shoulder at 950cm−1 is assigned to the symmetric stretching mode of trigonal boron. Raman bands at 627 and 651cm−1 are assigned to the out-of-plane bending modes of trigonal and tetrahedral boron. Raman spectroscopy coupled with infrared spectroscopy enables the molecular structure of the mineral sakhaite to be assessed.
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