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Mineralogical Magazine; February 2004; v. 68; no. 1; p. 167-175; DOI: 10.1180/0026461046810178
© 2004 Mineralogical Society of Great Britain and Ireland
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New insight into the crystal structure of orthorhombic edingtonite: evidence for a split Ba site

G. D. Gatta* and T. Boffa Ballaran

Bayerisches Geoinstitut, Universitaet Bayreuth, Universitaet Strasse 30, D-95447 Bayreuth, Germany

* E-mail: diego.gatta{at}uni-bayreuth.de

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) Å3. 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 zeolite, orthorhombic edingtonite, single-crystal X-ray diffraction, crystal structure, Ba-split site




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