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H (sub 2) O and CO (sub 2) in minerals of the haueyne-sodalite group; an FTIR spectroscopy study

F. Bellatreccia, G. Della Ventura, M. Piccinini, A. Cavallo and M. Brilli
H (sub 2) O and CO (sub 2) in minerals of the haueyne-sodalite group; an FTIR spectroscopy study
Mineralogical Magazine (June 2009) 73 (3): 399-413

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 approximately 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) Aa, to hauyne (sample HR3S) with a=9.1265(2) Aa. The specimens, having the SO (super 2-) (sub 4) 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 CO (sub 2) molecules, in addition to H (sub 2) O and minor carbonate, while sodalite is virtually CO (sub 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.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 73
Serial Issue: 3
Title: H (sub 2) O and CO (sub 2) in minerals of the haueyne-sodalite group; an FTIR spectroscopy study
Affiliation: Universita Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy
Pages: 399-413
Published: 200906
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 59
Accession Number: 2010-023162
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: Istituto Nazionale di Geofisica e Vulcanologia, ITA, ItalyIstituto di Geologia Ambientale e Geoingegneria, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201014
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