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Crystals
Special Issues
Polycrystalline Varieties of Diamond
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Polycrystalline Varieties of Diamond

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Mineralogical Crystallography and Biomineralization".

Deadline for manuscript submissions: closed (1 December 2021) | Viewed by 8557

Special Issue Editor

Prof. Dr. Felix V. Kaminsky

E-Mail Website
Guest Editor
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS,Moscow, Russia
Interests: Geochemistry, Mineralogy, Petrology

Special Issue Information

Dear Colleagues,

There are several types of polycrystalline varieties of diamond: bort, diamondite, balas, carbonado, yakutite, and some others. They have different forms, structures, carbon and nitrogen isotope characteristics, and modes of origin. Unlike monocrystalline diamonds, formed within mantle rocks and transported to the Earth’s surface by kimberlite/lamproite pipes, bort and diamondite may form within kimberlite and lamproite magmas; lonsdaleite-bearing yakutite is a product of an impact process as a result of a meteorite hitting the Earth; and carbonado, most likely, crystallises under low-pressure conditions out of the “classical” diamond stability P-T field. Recently, aggregates of diamond were identified in products of volcanic eruptions. Various models have been offered to explain the origin of these polycrystalline varieties of diamond, and some of them remain enigmatic. A Special Issue plans to present new data on polycrystalline varieties of diamond and new hypotheses on their origin.

Prof. Dr. Felix V. Kaminsky
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • polycrystalline diamond
  • bort
  • diamodite
  • balas
  • carbonado
  • yakutite
  • lonsdaleite

Published Papers (1 paper)

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Research

23 pages, 7712 KiB  
Article
Morphology and Genesis of Ballas and Ballas-Like Diamonds
by Anton Pavlushin, Dmitry Zedgenizov, Evgeny Vasil’ev and Konstantin Kuper
Crystals 2021, 11(1), 17; https://doi.org/10.3390/cryst11010017 - 27 Dec 2020
Cited by 5 | Viewed by 6981
Abstract
Ballas diamond is a rare form of the polycrystalline radial aggregate of diamonds with diverse internal structures. The morphological features of ballas diamonds have experienced repeated revision. The need that this paper presents for development of a crystal-genetic classification was determined by a [...] Read more.
Ballas diamond is a rare form of the polycrystalline radial aggregate of diamonds with diverse internal structures. The morphological features of ballas diamonds have experienced repeated revision. The need that this paper presents for development of a crystal-genetic classification was determined by a rich variety of combined and transitional forms of ballas-like diamonds, which include aggregates, crystals, and intergrowths. The new crystal-genetic classification combines already-known and new morphological types of ballas as well as ballas-like diamonds discovered in the placers of Yakutia, the Urals, and Brazil. The ballas-like diamond forms include spherocrystals, aggregates with a single crystal core, split crystals, radial multiple twin intergrowths, and globular crystals. The crystal genetic scheme of the evolution of ballas and ballas-like diamonds is a sequence of the morphological types arranged in accordance with the conventional model of the dependence of the mechanism and diamond growth from carbon supersaturation developed by I. Sunagawa. The evolution of the growth forms of ballas and ballas-like diamonds was tracked based on the macrozonal structure of diamonds varying from a flat-faced octahedron to a fibrous cuboid with its transition forms to the radiating crystal aggregates. The morphological diversity of the ballas-like diamonds depends on the level of supersaturation, and abrupt changes of the level of supersaturation engender abrupt changes in a mechanism of crystal growth. The change in the rate of growth under the influence of adsorption and absorption of the mechanic impurities accompanied the sudden appearance of the autodeformation defects in the form of splitting and multiple radial twinning of crystals. The spherical shape of Yakutia ballas-like diamonds is due to the volumetric dissolution that results in the curved-face crystals of the “Urals” or “Brazilian” type associated with ballas diamonds in placers. Full article
(This article belongs to the Special Issue Polycrystalline Varieties of Diamond)
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