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GEOREF RECORD

The crystal chemistry of paulingite

Elio Passaglia, Alessandro F. Gualtieri and Eugenia Marchi
The crystal chemistry of paulingite
European Journal of Mineralogy (February 2001) 13 (1): 113-119

Abstract

The crystal chemistry of the uncommon zeolite paulingite, (K,Na,Ca (sub 0.5) Ba (sub 0.5) ) (sub 10) (Al (sub 10) Si (sub 32) O (sub 84) ).30H (sub 2) O, Z = 16, has been updated and revised on the basis of new chemical analyses and cell parameters of 10 samples from most of the known occurrences of this mineral. The framework cation content, defined as R = Si/(Si + Al), shows slight variations, in the range 0.73 to 0.79. The extra-framework cations are mainly K, Ca, Na and minor Ba; Mg and Sr are absent or negligible. The contents of K, Ca and Na are very variable, with examples of all three types of cation-dominance being found. The cell constant a shows small variations (from 35.03 to 35.24 Aa) and no significant correlation with the chemistry of the samples. The (Na + K) content is positively correlated with the Si content, and a strong negative correlation between Ca and Na is found. The water content is variable and independent of the chemical parameters. The dehydration process of the Ca-dominant sample is significantly different from that of both the K- and Na-dominant forms.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 1
Title: The crystal chemistry of paulingite
Affiliation: Universita di Modena e Reggio Emilia, Dipartimento di Scienze della Terra, Modena, Italy
Pages: 113-119
Published: 200102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 14
Accession Number: 2001-022813
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200108
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