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Zr-minerals
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Zr-minerals

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Crystallography and Physical Chemistry of Minerals & Nanominerals".

Deadline for manuscript submissions: closed (15 July 2019) | Viewed by 9992

Special Issue Editors

Dr. Natalia V. Zubkova

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Guest Editor
Department of Crystallography and Crystal Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Interests: XRD analysis; crystal structures; minerals; new structure types; crystal chemistry
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Gerald Giester

E-Mail Website
Guest Editor
Department of Mineralogy and Crystallography, University of Vienna, Althanstr. 14, A-1090 Vienna, Austria
Interests: Single crystal structure investigation of minerals and synthetic compounds; Synthesis of crystalline compounds; Gemological studies

Special Issue Information

Dear Colleagues,

We have the pleasure of inviting you to participate in a Special Issue of Minerals devoted to zirconium minerals. Zirconium is a very interesting and truly paradoxical chemical element from the mineralogical and geochemical viewpoints: being a rare element (its content in the Earth's crust is ca. 0.02 wt.%), Zr is known as a species-defining constituent of more than a hundred minerals, and some of them form huge and rich deposits, with resources of many millions of tons. Most zirconium minerals are silicates and oxides, which demonstrates the great diversity of crystal structures and physical properties. Zirconosilicates of the eudialyte group have the most complicated structures among all known natural inorganic compounds. Zirconium minerals possess many technologically important properties and are in wide use in different branches of modern industry. The increase of knowledge in the fields of crystal chemistry, properties, and the genesis of zirconium minerals is undoubtedly important for the development of both Earth and materials science.

Dr. Natalia V. Zubkova
Prof. Dr. Gerald Giester
Guest Editors

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. Minerals 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 2400 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

  • zirconium mineral
  • microporous zirconosilicate
  • zircon
  • baddeleyite, zirconolite
  • eudialyte
  • zirconium ore
  • zirconium mineral crystal chemistry

Published Papers (3 papers)

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Research

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10 pages, 1167 KiB  
Article
Crystal Chemistry of the Microporous Zirconosilicate Na6Zr3[Si9O27], a Product of High-Temperature Transformation of Catapleiite, and Its Ag-Exchanged Form
by Natalia V. Zubkova, Dmitry A. Ksenofontov, Nikita V. Chukanov, Igor V. Pekov, Anna A. Artamonova, Natalia N. Koshlyakova, Andrey Yu. Bychkov and Dmitry Yu. Pushcharovsky
Minerals 2020, 10(3), 243; https://doi.org/10.3390/min10030243 - 7 Mar 2020
Cited by 3 | Viewed by 2601
Abstract
The crystal structure of the Ag-exchanged form of the zirconosilicate with the simplified formula (Na6-2xCax▯x)Zr3[Si9O27] with x < 1 (the idealized formula Na6Zr3[Si9O27 [...] Read more.
The crystal structure of the Ag-exchanged form of the zirconosilicate with the simplified formula (Na6-2xCax▯x)Zr3[Si9O27] with x < 1 (the idealized formula Na6Zr3[Si9O27]), a product of thermal transformation of catapleiite, ideally Na2Zr[Si3O9]·2H2O, was studied using single crystal X-ray diffraction data. The crystal structure of Na6Zr3[Si9O27] is based on a heteropolyhedral framework built by nine-membered tetrahedral rings [Si9O27] and isolated [ZrO6] octahedra. This zirconosilicate demonstrates high exchange capacity to Ag (experiment with 1 M AgNO3 aqueous solution, 250 °C, 30 days). Its Ag-exchanged form with the simplified formula (Ag5Ca0.5)Zr3[Si9O27] is characterized by a significant distortion of the heteropolyhedral framework and strongly disordered arrangement of extra-framework cations (Ag) which results in the doubling of a parameter of the hexagonal unit cell [a = 23.3462(3), c = 10.10640(10) Å, V = 4770.45(13) Å3] and space group P63cm. Ag+ cations preferably occupy the sites that are close to the Na sites in Na6Zr3[Si9O27]. Full article
(This article belongs to the Special Issue Zr-minerals)
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16 pages, 6422 KiB  
Article
Crystal Chemistry and Properties of Elpidite and Its Ag-Exchanged Forms
by Natalia V. Zubkova, Rositsa P. Nikolova, Nikita V. Chukanov, Vladislav V. Kostov-Kytin, Igor V. Pekov, Dmitry A. Varlamov, Tatiana S. Larikova, Olga N. Kazheva, Nadezhda A. Chervonnaya, Gennadiy V. Shilov and Dmitry Yu. Pushcharovsky
Minerals 2019, 9(7), 420; https://doi.org/10.3390/min9070420 - 10 Jul 2019
Cited by 8 | Viewed by 2824
Abstract
Elpidite from the Lovozero alkaline complex, Kola Peninsula, Russia, and Ag-exchanged forms of elpidite from two different localities (Lovozero and Khan Bogdo, Mongolia) were studied by means of single-crystal X-ray diffraction, electron microprobe analysis, thermogravimetry and IR spectroscopy. All studied samples retain the [...] Read more.
Elpidite from the Lovozero alkaline complex, Kola Peninsula, Russia, and Ag-exchanged forms of elpidite from two different localities (Lovozero and Khan Bogdo, Mongolia) were studied by means of single-crystal X-ray diffraction, electron microprobe analysis, thermogravimetry and IR spectroscopy. All studied samples retain the heteropolyhedral framework consisting of double Si6O15 chains (ribbons) and isolated ZrO6 octahedra. Zeolitic cavities in the initial elpidite from Lovozero (space group Pbm2, a = 14.6127(7), b = 7.3383(4), c = 7.1148(3) Å, V = 762.94(6) Å3) are occupied by Na+ cations and H2O molecules. Both Ag-exchanged forms are characterized by evident distortions of the heteropolyhedral framework and a strongly disordered arrangement of extra-framework cations which results in the appearance of the 14-14-14 Å unit cell (a = 14.1755(7), b = 14.6306(9), c = 14.2896(7) Å, V = 2963.6(3) Å3 for the Ag-exchanged form of elpidite from Lovozero and a = 14.1411(5), b = 14.5948(4), c = 14.3035(5) Å, V = 2952.04(17) Å3 for the Ag-exchanged form of elpidite from Khan Bogdo) and space group Cmce. Elpidite from both localities demonstrates a high exchange capacity to Ag. Exchanged Ag+ cations preferably occupy the sites that are close to the Na sites in the initial elpidite. The paper also contains a review of crystal chemical data on elpidite and its laboratory-modified forms. Full article
(This article belongs to the Special Issue Zr-minerals)
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Review

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14 pages, 1487 KiB  
Review
The Tale of Greenlandite: Commemorating the Two-Hundredth Anniversary of Eudialyte (1819–2019)
by Axel S.L. Sjöqvist
Minerals 2019, 9(8), 497; https://doi.org/10.3390/min9080497 - 19 Aug 2019
Cited by 6 | Viewed by 4050
Abstract
Twenty years before the discovery of the mineral eudialyte, a red garnet-like mineral from Greenland was distributed among mineralogists and chemists in Europe. Furthermore, the first chemical analyses of the Greenlandic mineral reported 10 percent by weight of zirconium oxide. It was given [...] Read more.
Twenty years before the discovery of the mineral eudialyte, a red garnet-like mineral from Greenland was distributed among mineralogists and chemists in Europe. Furthermore, the first chemical analyses of the Greenlandic mineral reported 10 percent by weight of zirconium oxide. It was given the name greenlandite, and after the discovery of eudialyte many have wondered whether greenlandite could actually be eudialyte. Two-hundred years after the original definition of eudialyte I have tried to find out. Full article
(This article belongs to the Special Issue Zr-minerals)
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