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Surface morphology and structural types of natural impact apographitic diamonds

  • Production, Structure, Properties
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Abstract

External and internal morphologies of natural impact apographitic diamonds (paramorphoses) have been studied. The (0001) surface morphology of the paramorphoses reflects their phase composition and the structural relationship of its constituting phases. Growth and etch figures together with the elements of crystal symmetry of lonsdaleite and diamond are developed on these surfaces. The crystal size of lonsdaleite is up to 100 nm, and that of diamond is up to 300 nm. Two types of structural relations between graphite, lonsdaleite, and diamond in the paramorphoses are observed: the first type (black, black-gray, colorless and yellowish paramorphoses): the (0001) graphite face is parallel to the (100) lonsdaleite face and parallel to (111) diamond; the second type (milky-white paramorphoses): the (0001) graphite is parallel to the (100) lonsdaleite and parallel to the (112) diamond. The first type of the paramorphoses contains lonsdaleite, diamond, graphite or diamond, lonsdaleite, the second type of the paramorphoses contains predominantly diamond. The direct phase transition of graphite → lonsdaleite and/or graphite →diamond occurred in the paramorphoses of the first type. A successive phase transition graphite → lonsdaleite → diamond was observed in the paramorphoses of the second type. The structure of the paramorphoses of this type shows characteristic features of recrystallization.

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Authors and Affiliations

  1. Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Sciences of Ukraine, Palladin Avenue 34, 03680, Kiev 142, Ukraine

    V. Kvasnytsya

  2. Helmholtz Centre Potsdam, German Research Centre for Geosciences, GFZ, Telegrafenberg, 14473, Potsdam, Germany

    R. Wirth

  3. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems and Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia

    S. Piazolo & D. E. Jacob

  4. Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, NSW 2006, Australia

    P. Trimby

Authors
  1. V. Kvasnytsya
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  2. R. Wirth
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  3. S. Piazolo
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  4. D. E. Jacob
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  5. P. Trimby
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Correspondence to V. Kvasnytsya.

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The text was submitted by the authors in English.

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Kvasnytsya, V., Wirth, R., Piazolo, S. et al. Surface morphology and structural types of natural impact apographitic diamonds. J. Superhard Mater. 38, 71–84 (2016). https://doi.org/10.3103/S1063457616020015

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  • DOI: https://doi.org/10.3103/S1063457616020015

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