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Journal of Superhard Materials

, Volume 38, Issue 2, pp 71–84 | Cite as

Surface morphology and structural types of natural impact apographitic diamonds

  • V. KvasnytsyaEmail author
  • R. Wirth
  • S. Piazolo
  • D. E. Jacob
  • P. Trimby
Production, Structure, Properties

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.

Keywords

natural impact apographitic diamond graphite lonsdaleite diamond surface morphology structure type 

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Copyright information

© Allerton Press, Inc. 2016

Authors and Affiliations

  • V. Kvasnytsya
    • 1
    Email author
  • R. Wirth
    • 2
  • S. Piazolo
    • 3
  • D. E. Jacob
    • 3
  • P. Trimby
    • 4
  1. 1.Institute of Geochemistry, Mineralogy and Ore FormationNational Academy of Sciences of UkraineKiev 142Ukraine
  2. 2.Helmholtz Centre Potsdam, German Research Centre for GeosciencesGFZ, TelegrafenbergPotsdamGermany
  3. 3.Australian Research Council Centre of Excellence for Core to Crust Fluid Systems and Department of Earth and Planetary SciencesMacquarie UniversityNorth RydeAustralia
  4. 4.Australian Centre for Microscopy and MicroanalysisThe University of SydneySydneyAustralia

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