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Kagomé networks of octahedrally coordinated metal atoms in minerals: Relating different mineral structures through octahedral tilting

Published online by Cambridge University Press:  17 September 2020

Ian E. Grey Open the ORCID record for Ian E. Grey [Opens in a new window]
Ian E. Grey*
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3168, Australia
*
*Author for correspondence: Ian E. Grey, Email: [email protected]
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Abstract

Kagomé nets of corner-connected triangles of atoms occur in diverse minerals, from the {111} anion arrays in perovskite-group minerals to natural metallic alloys like auricupride, AuCu3, to the cation layers in atacamite-group minerals. We review here two- and three-dimensional kagomé networks in minerals where the kagomé node atoms are octahedrally coordinated in hexagonal tungsten bronze (HTB) arrays. Octahedral tilting, coupled with capping of the apical anions of the triangular groupings of octahedra in the HTB layers, gives rise to several important mineral groups, including pyrochlores, alunite-supergroup minerals, zirconolite and weberite polytypes and spinel-group minerals, as a function of the magnitude and type of the octahedral tilting.

Keywords

kagomé netshexagonal tungsten bronze arraysoctahedral tiltingpyrochloreweberitezirconolitealunite-group mineralsunit-cell intergrowth minerals
Type
Review
Information
Mineralogical Magazine , Volume 84 , Issue 5 , October 2020 , pp. 640 - 652
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: G. Diego Gatta

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