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Minerals 2019, 9(2), 110; https://doi.org/10.3390/min9020110

Natural Graphite Cuboids

1
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga Avenue, 630090 Novosibirsk, Russia
2
Department of Physics and the A.E. Seaman Mineral Museum, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, USA
*
Author to whom correspondence should be addressed.
Received: 12 December 2018 / Revised: 27 January 2019 / Accepted: 5 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Mineralogy of Natural Graphite)
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Abstract

Graphite cuboids are abundant in ultrahigh-pressure metamorphic rocks and are generally interpreted as products of partial or complete graphitization of pre-existing diamonds. The understanding of the graphite cuboid structure and its formation mechanisms is still very limited compared to nanotubes, cones, and other carbon morphologies. This paper is devoted to the natural occurrences of graphite cuboids in several metamorphic and magmatic rocks, including diamondiferous metamorphic assemblages. The studied cuboids are polycrystalline aggregates composed either of numerous smaller graphite cuboids with smooth surfaces or graphite flakes radiating from a common center. Silicates, oxides, and sulphides are abundant in all the samples studied, testifying that the presence of oxygen, sulfur, or sulphides in natural systems does not prevent the spherulitic growth of graphite. The surface topography and internal morphology of graphite cuboids combined with petrological data suggest that graphite cuboids originated from a magmatic or metamorphic fluid/melt and do not represent products of diamond-graphite transformation processes, even in diamond-bearing rocks. View Full-Text
Keywords: graphite cuboid; diamond; cliftonite; sulphide graphite cuboid; diamond; cliftonite; sulphide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Korsakov, A.V.; Rezvukhina, O.V.; Jaszczak, J.A.; Rezvukhin, D.I.; Mikhailenko, D.S. Natural Graphite Cuboids. Minerals 2019, 9, 110.

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