Relationships between cation substitution and hydrogen-bond system in hydrous pyroxenoids with a twisted chain consisting of three SiO4 tetrahedra are investigated by means of chemical and X-ray single-crystal structural analysis. Minerals with the common crystal-chemical
1+)M1, M2 (Me
2+)2 [Si3 O8 (OH)], Me
1+ = Na, Li and Me
2+ = Ca, Mn, Mg, comprising pectolite, Li-bearing pectolite, murakamiite, marshallsussmanite, serandite,
and tanohataite were studied. In pectolite and murakamiite two structurally independent octahedrally coordinated sites (M1 and M2) are occupied by Ca. In marshallsussmanite, serandite, and tanohataite, the site occupancies at M1 and M2 are M1 [Ca0.764(7) Mn0.236]M2
[Mn0.910(8) Ca0.090 ],M1 [Mn0.758 (4) Ca0.242]M2 [Mn1.0], andM1 [Mn0.87(2) Ca0.13]M2 [Mn0.943(9) Mg0.057], respectively. The Ca and Mn contents primarily
influence and distances and hence the unit-cell parameters. The a, b, and c dimensions increase linearly with Ca content. Moreover, high Li concentration at M3 reduces the cell dimensions. The incorporation of smaller Li+
ions for larger Na+ ions at M3 modifies the coordination polyhedron due to the shift of the atomic position, and it decreases the coordination number of M3. The oxygen atoms at O3 and O4 host the hydroxyl group, and both oxygen sites may act as donor and acceptor of the hydrogen
bond. With increasing Mn content the O3···O4 distance reduces from 2.487(3) Å in murakamiite to 2.447(7) A in tanohataite. A short O3···O4 distance also facilitates disordered hydrogen bonds. The hydrogen-bond system in pyroxenoids with three-periodic
single-chain of SiO4 tetrahedra depends on (1) the Na and Li position at the M3 site and (2) the O3···O4 distance.
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Document Type: Research Article
Publication date: June 1, 2018
This article was made available online on April 3, 2018 as a Fast Track article with title: "Relationship between cation substitution and hydrogen-bond system in hydrous pyroxenoids with three-periodic single-chain of SiO4 tetrahedra: pectolite, murakamiite, marshallsussmanite, serandite and tanohataite".
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The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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