Publication details
Raman microscopy of haidingerite Ca(AsO3OH).H2O and brassite Mg(AsO3OH).4H2O
| Authors | |
|---|---|
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Journal of Raman Spectroscopy |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | brassite; haidingerite; hydrogenarsenates; molecular water; hydroxyls; Raman spectroscopy |
| Description | Raman spectroscopy has been used to study the arsenate minerals haidingerite Ca(AsO3OH) . H2O and brassite Mg(AsO3OH). 4H2O. Intense Raman bands in the haidingerite spectrum observed at 745 and 855 cm-1 are assigned to the (AsO3OH)2- antisymmetric stretching and symmetric stretching vibrational modes. For brassite, two similarly assigned intense bands are found at 809 and 862 cm-1. The observation of multiple Raman bands in the (AsO3OH)2- stretching and bending regions suggests that the arsenate tetrahedrons in the crystal structures of both minerals studied are strongly distorted. |