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.

BELLATRECCIA F, DELLA VENTURA G, PICCININI M, CAVALLO A, BRILLI, & M (2009). H2O and CO2 in minerals of the hauyine-sodalite group: an FTIR spectroscopic study. MINERALOGICAL MAGAZINE, 73, 399-423 [10.1180/minmag.2009.073.3.399].

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

BELLATRECCIA, FABIO;DELLA VENTURA, Giancarlo;
2009

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 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.
BELLATRECCIA F, DELLA VENTURA G, PICCININI M, CAVALLO A, BRILLI, & M (2009). H2O and CO2 in minerals of the hauyine-sodalite group: an FTIR spectroscopic study. MINERALOGICAL MAGAZINE, 73, 399-423 [10.1180/minmag.2009.073.3.399].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/117396
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