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Plastic deformation of natural diamonds by twinning: evidence from X-ray diffraction studies

Published online by Cambridge University Press:  05 July 2018

S.V. Titkov ,
S. V. Krivovichev  and
N. I. Organova
S.V. Titkov*
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Staromonetny 35, 119017 Moscow, Russia
S. V. Krivovichev
Affiliation:
St Petersburg State University, Universitetskaya Emb., 7/9, 199034 St Petersburg, Russia
N. I. Organova
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Staromonetny 35, 119017 Moscow, Russia
*
*E-mail: [email protected]
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Abstract

A pink-purple diamond crystal from the Internatsional'naya kimberlite pipe (Siberia) was studied by single-crystal X-ray diffraction techniques using an area detector. Direct indexing of the diffraction pattern suggested a primitive hexagonal unit cell [ahex = 2.513(4), chex = 6.172(11) Å], instead of the well known face-centred cubic unit cell (acub ∼3.567 Å). Theoretical considerations and diffraction pattern simulation showed that the hexagonal diffraction pattern is the result of the superposition of two diffraction patterns with cubic symmetry due to spinel-law twinning along (111). These data are in good agreement with previous analyses of deformation microtwins in natural pink-purple diamonds using electron paramagnetic resonance spectroscopy and optical microscopy. The results suggest that natural epigenetic plastic deformation of diamonds occurs not only by dislocation slipping but also as a result of mechanical twinning.

Keywords

diamondsingle-crystal diffractionmicrotwinningspinel-law twinplastic deformation
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 1 , February 2012 , pp. 143 - 149
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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