An SEM-EDX and Raman spectroscopic study of the fibrous arsenate mineral liskeardite and in comparison with other arsenates kankite, scorodite and yvonite

作者：Frost Ray L^*; Scholz Ricardo; Jirasek Jakub; Belotti Fernanda Maria

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2015, 151: 566-575.

DOI：10.1016/j.saa.2015.07.005

• Liskeardite
• Arsenate
• Scorodite
• Kankite
• Yvonite
• Raman spectroscopy
• Infrared spectroscopy

The mineral liskeardite, an arsenate mineral with major cations of iron and aluminium, has been studied by a combination of scanning electron microscopy with energy dispersive spectroscopy and Raman spectroscopy. The mineral shows a fibrous nature. Semi-quantitative chemical analysis shows an Al and Fe arsenate phase with minor amounts of K, Cu, S and Si. Scanning electron microscopy shows a fibrous material. Intense Raman bands at 893, 867 and 843 cm(-1) are assigned to the v(1) and v(3) AsO43- and HOAsO32- symmetric and antisymmetric stretching vibrations. Raman bands are observed at 514, 499, 485 and 477 cm(-1) and are assigned to the v(4) out of plane bending modes of the AsO43- and HOAsO32- units. The series of bands at 373, 356 and 343 cm(-1) are assigned to the v(2) symmetric bending modes. Two groups of OH stretching bands are observed and assigned to OH unit and water stretching vibrations. A comparison of the Raman spectrum of liskeardite with scorodite, kankite and yvonite is made.

• 出版日期2015-12-5