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High-pressure structural behaviour of scolecite

Paola Comodi, Giacomo Diego Gatta and Pier Francesco Zanazzi
High-pressure structural behaviour of scolecite
European Journal of Mineralogy (June 2002) 14 (3): 567-574

Abstract

The HP structural evolution of a natural scolecite from Iceland (space group Cc) was studied up to 5 GPa using in situ single-crystal X-ray diffraction data from a diamond-anvil cell (DAC) with silicon oil as non penetrating pressure transmitting medium. Linear regressions yielded mean axial compressibilities for a, b and c axes of beta (sub a) = 4.4(2).10 (super -3) , beta (sub b) = 6.1(2).10 (super -3) , beta (sub c) = 6.0(1).10 (super -3) GPa (super -1) . K (sub 0) , refined with a second-order Birch-Murnaghan equation, fixing K' (sub 0) at 4, is 54.6(7) GPa. The bulk scolecite structure compression was the result of the "soft" behaviour of the channels (K congruent to 17 GPa for [100]-channels; K congruent to 50 GPa for [001]-channels) and the more rigid behaviour of the tetrahedral framework (K congruent to 96 GPa), which underwent kinking of the Secondary Building Unit (SBU) along [100]-chains. The angle between the SBUs (phi ), increased from 20.80(2) degrees at 0.0001 GPa, to 22.00(6) degrees at 3.38 GPa. Within the investigated pressure range, the position of the extra-framework cations and water molecules remained almost unchanged. Up to 4.2 GPa no phase transition was observed.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 3
Title: High-pressure structural behaviour of scolecite
Affiliation: Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy
Pages: 567-574
Published: 200206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 43
Accession Number: 2002-047658
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200216
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