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Authors: Bellatreccia, F.* 
Della Ventura, G.* 
Piccinini, M.* 
Cavallo, A.* 
Brilli, M.* 
Title: H2O and CO2 in minerals of the hauyne-sodalite group: an FTIR spectroscopy study
Issue Date: 6-Jul-2009
Series/Report no.: /73(2009)
DOI: 10.1180/minmag.2009.073.3.399
Keywords: sodalite, hauyne, nosean, lazurite, H2O and CO2, cell parameters, EMP analysis, CHN analysis, FTIR powder, single-crystal spectroscopy
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
Abstract: 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 ~1; the extra framework cation content is characterized by a well-defined Na -(Ca+K) substitution. The lattice parameters of the studied samples range from sodalite (sample LM11) with a = 8.889(2) A , to hauyne (sample HR3S) with a = 9.1265(2) A. The specimens, having the SO4-- group as a dominant anion, show a clear correlation between the a cell edge and the K content. Single-crystal FTIR spectroscopy shows that hauyne and nosean typically contain enclathrated CO2 molecules,in addition to H2O and minor carbonate, while sodalite is virtually CO2-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.
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