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Published online 3 September 2009
Mineralogical Magazine; June 2009; v. 73; no. 3; p. 399-413; DOI: 10.1180/minmag.2009.073.3.399
© 2009 Mineralogical Society of Great Britain and Ireland
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Right arrow Articles by Brilli, M.

H2O and CO2 in minerals of the haüyne-sodalite group: an FTIR spectroscopy study

F. Bellatreccia1,2,*, G. Della Ventura1,2, M. Piccinini1,2,{dagger}, A. Cavallo3 and M. Brilli4

1 Dipartimento di Scienze Geologiche, Università Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy
2 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (I.N.F.N.-L.N.F.), Via Enrico Fermi 40 I-00044 Frascati (Roma), Italy
3 Istituto Nazionale di Geofisica e Vulcanologia (I.N.G.V.), Via di Vigna Murata 605, I-00143 Roma, Italy
4 Istituto di Geologia Ambientale e Geoingegneria (C.N.R.-I.G.A.G.), Via Salaria km 29,300 - C.P. 10 Monterotondo Stazione, I-00016 Roma, Italy

* E-mail: bellatre{at}uniroma3.it

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 {rightleftharpoons} (Ca+K) substitution. The lattice parameters of the studied samples range from sodalite (sample LM11) with a = 8.889(2) Å, to haüyne (sample HR3S) with a = 9.1265(2) Å. The specimens, having the Formula group as a dominant anion, show a clear correlation between the a cell edge and the K content. Single-crystal FTIR spectroscopy shows that haüyne 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.

KEYWORDS: sodalite, haüyne, nosean, lazurite, H2O and CO2, cell parameters, EMP analysis, CHN analysis, FTIR powder, single-crystal spectroscopy






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