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  • Title: Assessment of the molecular structure of the borate mineral boracite Mg3B7O13Cl using vibrational spectroscopy.
    Author: Frost RL, Xi Y, Scholz R.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2012 Oct; 96():946-51. PubMed ID: 22940636.
    Abstract:
    Boracite is a magnesium borate mineral with formula: Mg(3)B(7)O(13)Cl and occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic - pyramidal crystal system. An intense Raman band at 1009 cm(-1) was assigned to the BO stretching vibration of the B(7)O(13) units. Raman bands at 1121, 1136, 1143 cm(-1) are attributed to the in-plane bending vibrations of trigonal boron. Four sharp Raman bands observed at 415, 494, 621 and 671 cm(-1) are simply defined as trigonal and tetrahedral borate bending modes. The Raman spectrum clearly shows intense Raman bands at 3405 and 3494 cm(-1), thus indicating that some Cl anions have been replaced with OH units. The molecular structure of a natural boracite has been assessed by using vibrational spectroscopy.
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