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Crystal structure of 2 M and 1 A polytypes of balangeroite by Elena Bonaccorsi; Giovanni Ferraris; Stefano Merlino is a Chemistry article available to read on EtoBox.

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Balangeroite, with ideal crystal chemical formula (Mg,Fe) 42 O 6 (Si 4 O 12 ) 4 (OH) 40 , displays two MDO polytypes, balangeroite-2M (a 1⁄4 19.179, b 1⁄4 9.601, c 1⁄4 19.218 A ̊, b 1⁄4 90.52 ; space group P2/n) and balangeroite-1A (a 1⁄4 9.602, b 1⁄4 13.891, c 1⁄4 14.012 A ̊, a 1⁄4 86.99 , b 1⁄4 76.79 , g 1⁄4 76.67 ; space group P 1 1). Both polytypes are built up by octahedral walls 3 Â 1, octahedral bundles 2 Â 2 and four-repeat silicate chains. All these modules run parallel to the 9.6 A ̊axis (b and a in the monoclinic and triclinic polytype, respectively). The distinguishing features between the two polytypes are in the different positioning of the silicate chains, which gives rise to distinct cells and space groups.

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Author

Elena Bonaccorsi; Giovanni Ferraris; Stefano Merlino

Publisher

Walter de Gruyter GmbH

Published

2012

Language

EN

Field

Chemistry (Physical Sciences)