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New insight into the crystal structure of orthorhombic edingtonite: evidence for a split Ba site

Published online by Cambridge University Press:  05 July 2018

G. D. Gatta  and
T. Boffa Ballaran
G. D. Gatta*
Affiliation:
Bayerisches Geoinstitut, Universitaet Bayreuth, Universitaet Strasse 30, D-95447 Bayreuth, Germany
T. Boffa Ballaran
Affiliation:
Bayerisches Geoinstitut, Universitaet Bayreuth, Universitaet Strasse 30, D-95447 Bayreuth, Germany
*
*E-mail: diego.gatta@uni-bayreuth.de
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Abstract

Orthorhombic edingtonite has been found coexisting with tetragonal edingtonite in a specimen from Ice River, British Columbia, Canada.

We report data on the composition and crystal structure of the orthorhombic sample. Lattice parameters are: a = 9.5341(6), b = 9.6446(6), c = 6.5108(7)Å, V = 598.68(8)Å 3. The crystal structure was refined in space group P 21212 to R1 = 1.8% using 879 observed reflections. For the first time, evidence for splitting of the extra-framework Ba site in two different sites (Ba1, Ba2), ~0.37 Å apart, is demonstrated. A comparison with the published crystal structures of tetragonal and orthorhombic edingtonite is made.

The present result supports the suggestion that the two edingtonite phases are a consequence of different nucleation phenomena and not different physicochemical conditions.

Keywords

fibrous zeoliteorthorhombic edingtonitesingle-crystal X-ray diffractioncrystal structureBa-split site
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 1 , February 2004 , pp. 167 - 175
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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