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The crystal chemistry of cowlesite

Published online by Cambridge University Press:  05 July 2018

Giovanna Vezzalini ,
Gilberto Artioli ,
Simona Quartieri  and
Harry Foy
Giovanna Vezzalini
Affiliation:
Istituto di Mineralogia e Petrologia, Università di Modena Via S. Eufemia 19, 41100 Modena, Italy
Gilberto Artioli
Affiliation:
Istituto di Mineralogia e Petrologia, Università di Modena Via S. Eufemia 19, 41100 Modena, Italy
Simona Quartieri
Affiliation:
Istituto di Mineralogia e Petrologia, Università di Modena Via S. Eufemia 19, 41100 Modena, Italy
Harry Foy
Affiliation:
19 Wynard Park, Belfast BT5 6NS, Northern Ireland
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Abstract

Cowlesite specimens from nine new occurrences in Northern Ireland and from eight localities previously reported in the literature, were crystal-chemically characterised. The chemical data for a total of 25 samples indicate a composition close to the stoichiometric formula for cowlesite and a very limited compositional range. X-ray powder diffraction spectra were performed on 8 samples. The crystallographic unit cell permit a proper indexing of the X-ray powder diffraction patterns as orthorhombic, unit cell constants close to a 23.3, b 30.6, c 25.0 Å and doubled with respect to those originally reported in literature. The powder pattern and the TG curve arc reported for an unidentified mineral species associated with cowlesite in one of the samples from Northern Ireland.

Keywords

zeolitecowlesiteelectron microprobe analysisthermal analysispowder patternlattice constants
Type
Research Article
Information
Mineralogical Magazine , Volume 56 , Issue 385 , December 1992 , pp. 575 - 579
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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