H2O and CO2 in minerals of the hauyine-sodalite group: an FTIR spectroscopic study

This paper reports an infrared spectroscopic study of a set of sodalite-group minerals. The specimens have been identified using a combination of X-ray diffraction and microchemical analysis. As expected, the Si/Al ratio is similar to 1; the extra framework cation content is characterized by a well-defined Na reversible arrow (Ca+K) substitution. The lattice parameters of the studied samples range from sodalite (sample LM11) with a = 8.889(2) angstrom, to hauyne (sample HR3S) with a = 9.1265(2) angstrom. The specimens, having the SO(4)(2-) group as a dominant anion, show a clear correlation between the a cell edge and the K content. Singlecrystal FTIR spectroscopy shows that hauyne and nosean typically contain enclathrated CO(2) molecules, inadditionto H(2)O and minor carbonate, while sodalite is virtually CO(2)-free. Detailed microspectrometric mappings show a non-homogeneous distribution of volatile constituents across the crystals, which may be related to the presence of fractures in the crystals. Because of such zoning, a relatively wide variation is observed when calibrating extinction coefficients on the basis of a bulk analytical method such as CHN elemental analysis.