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Electron microscopy of oxyborates. I. Defect structures in the minerals pinakiolite, ludwigite, orthopinakiolite and takeuchiite

Electron microscopy of oxyborates. I. Defect structures in the minerals pinakiolite, ludwigite,... Crystals of the minerals pinakiolite (Mg,Mn)1.77-(Mn,Al,Fe)1.11BO5, ludwigite (Mg,Fe)2Fe3+BO5, orthopinakiolite (Mg,Mn)1.85(Mn3+,Fe3+)BO5 and takeuchiite (Mg,Mn)1.97Mn3+0.78Fe3+0.19BO5 have been investigated by high-resolution transmission electron microscopy. Calculated and experimental images have been matched to ensure a proper interpretation. All the minerals except ludwigite show structural defects which give insight into structural relations in the pinakiolite family. It is shown that they can be described as chemical twinnings of pinakiolite. The most common defects can be described as missing twin operations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography International Union of Crystallography

Electron microscopy of oxyborates. I. Defect structures in the minerals pinakiolite, ludwigite, orthopinakiolite and takeuchiite

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Electron microscopy of oxyborates. I. Defect structures in the minerals pinakiolite, ludwigite, orthopinakiolite and takeuchiite

Bovin, J.-O; O'Keeffe, M; O'Keefe, M.A
Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography , Volume 37 (1): 28 – Jan 1, 1981

Abstract

Crystals of the minerals pinakiolite (Mg,Mn)1.77-(Mn,Al,Fe)1.11BO5, ludwigite (Mg,Fe)2Fe3+BO5, orthopinakiolite (Mg,Mn)1.85(Mn3+,Fe3+)BO5 and takeuchiite (Mg,Mn)1.97Mn3+0.78Fe3+0.19BO5 have been investigated by high-resolution transmission electron microscopy. Calculated and experimental images have been matched to ensure a proper interpretation. All the minerals except ludwigite show structural defects which give insight into structural relations in the pinakiolite family. It is shown that they can be described as chemical twinnings of pinakiolite. The most common defects can be described as missing twin operations.

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References (5)

Publisher
International Union of Crystallography
Copyright
Copyright (c) 1981 International Union of Crystallography
ISSN
0567-7394
DOI
10.1107/S0567739481000065
Publisher site
See Article on Publisher Site

Abstract

Crystals of the minerals pinakiolite (Mg,Mn)1.77-(Mn,Al,Fe)1.11BO5, ludwigite (Mg,Fe)2Fe3+BO5, orthopinakiolite (Mg,Mn)1.85(Mn3+,Fe3+)BO5 and takeuchiite (Mg,Mn)1.97Mn3+0.78Fe3+0.19BO5 have been investigated by high-resolution transmission electron microscopy. Calculated and experimental images have been matched to ensure a proper interpretation. All the minerals except ludwigite show structural defects which give insight into structural relations in the pinakiolite family. It is shown that they can be described as chemical twinnings of pinakiolite. The most common defects can be described as missing twin operations.

Journal

Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography – International Union of Crystallography

Published: Jan 1, 1981

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