Vibrational spectroscopy of the borate mineral chambersite MnB7O13Cl--implications for the molecular structure
Ray L Frost1, Andrés López1, Ricardo Scholz2
1School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Abstract:
Chambersite is a manganese borate mineral with formula: MnB7O13Cl and occurs as colorless crystals in the monoclinic pyramidal crystal system. Raman bands at 902, 920, 942 and 963 cm(-1) are assigned to the BO stretching vibration of the B7O13 units. Raman bands at 1027, 1045, 1056, 1075 and 1091 cm(-1) are attributed to the BCl in-plane bending modes. The intense infrared band at 866 cm(-1) is assigned to the trigonal borate stretching modes. The Raman band at 660 cm(-1) together with bands at 597, 642 679, 705 and 721 cm(-1) are assigned to the trigonal and tetrahedral borate bending modes. The molecular structure of a natural chambersite has been assessed using vibrational spectroscopy.
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