A vibrational spectroscopic study of the silicate mineral inesite Ca-2(Mn,Fe)(7)Si10O28(OH)center dot 5H(2)O

作者：Frost Ray L^*; Lopez Andres; Xi Yunfei; Scholz Ricardo

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2014, 128: 207-211.

DOI：10.1016/j.saa.2014.02.115

• Inesite
• Silicate
• N%26apos
• chwaning mine
• Raman spectroscopy
• Infrared spectroscopy

We have studied the hydrated hydroxyl silicate mineral inesite of formula Ca-2(Mn,Fe)(7)Si10O28(OH)center dot 5H(2)O using a combination of scanning electron microscopy with EDX and Raman and infrared spectroscopy. SEM analysis shows the mineral to be a pure monomineral with no impurities. Semiquantitative analysis shows a homogeneous phase, composed by Ca, Mn2+, Si and P. with minor amounts of Mg and Fe. %26lt;br%26gt;Raman spectrum shows well resolved component bands at 997, 1031, 1051, and 1067 cm(-1) attributed to a range of SiO symmetric stretching vibrations of [Si10O28] units. Infrared bands found at 896, 928, 959 and 985 cm(-1) are attributed to the OSiO antisymmetric stretching vibrations. An intense broad band at 653 cm(-1) with shoulder bands at 608, 631 and 684 cm(-1) are associated with the bending modes of the OSiO units of the 6- and 8-membered rings of the [Si10O28] units. The sharp band at 3642 cm(-1) with shoulder bands at 3612 and 3662 cm(-1) are assigned to the OH stretching vibrations of the hydroxyl units. The broad Raman band at 3420 cm(-1) with shoulder bands at 3362 and 3496 cm(-1) are assigned to the water stretching vibrations. The application of vibrational spectroscopy has enabled an assessment of the molecular structure of inesite to be undertaken.

• 出版日期2014-7-15