What is it about?

The shape of octahedral crystals (such as diamonds) is usually not perfect. As a rule, their facets are unequally developed, forming the so-called “real form” of the crystal. To record it for crystallographic follow-up studies, we propose a method in which only five simple linear parameters are enough to be measured.

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Why is it important?

The octahedral real form can be considered as one of the features of diamonds connecting their symmetry with the host rock anisotropy. The measurement results can be used to restore the lost crystal shape in case of man-made damage, to gemological estimate crystal volume/mass losses, to evaluate and sort them by shape and degree of distortion.

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This page is a summary of: The description of octahedral crystals using five parameters, Acta Crystallographica Section A Foundations and Advances, May 2024, International Union of Crystallography,
DOI: 10.1107/s2053273324003097.
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