Special Issue "Layered Minerals and Materials: Crystal Structures, Properties and Applications"

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

Deadline for manuscript submissions: 1 November 2019

Special Issue Editor

Guest Editor
Dr. Oleg Siidra

Department of Crystallography, Saint-Petersburg State University, Saint-Petersburg, Russia
Website | E-Mail
Interests: minerals; Earth sciences; crystallography; X-ray diffraction; inorganic chemistry; layered minerals and materials; exhalative minerals

Special Issue Information

Dear Colleagues,

Layered minerals and inorganic materials include compounds structurally based on two-dimensional tetrahedral or heteropolyhedral complexes. Nowadays, layered minerals and related synthetic compounds are extensively investigated in very different fields, from mineralogy, geochemistry, and biogeochemistry to solid-state physics, inorganic chemistry, and materials science. The most well-known class of layered compounds with a wide range of applications is represented by clay minerals, which include a number of different groups: kaolinite–serpentine, talc and pyrophyllite, smectite, chlorite, etc. The relatively recent discovery of clay minerals in meteorites allowed to suggest that the formation of minerals with a layered structure was an important prerequisite for the appearance of self-replicating organic compounds on Earth. In addition to clay minerals, such layered materials as layered double hydroxides (LDH), hybrid organo-inorganic compounds, titanosilicates, etc. are obtained using a wide variety of synthesis methods in the chemical industry. Most of the layered materials used in our days in various industries are analogues of known minerals or related mineral-like phases.

This Special Issue welcomes contributions on layered minerals and materials, layered crystal structures, and on applications of clay minerals and layered double hydroxides, composite materials.

Dr. Oleg Siidra
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 papers will be 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 1400 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

  • layered materials
  • layered minerals
  • layered double hydroxides (LDH)
  • clay minerals
  • sorbents
  • composite materials
  • organically templated materials
  • layered minerals and materials characterization methods

Published Papers (1 paper)

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Research

Open AccessArticle
Crystal Chemistry of Chlormagaluminite, Mg4Al2(OH)12Cl2(H2O)2, a Natural Layered Double Hydroxide
Minerals 2019, 9(4), 221; https://doi.org/10.3390/min9040221
Received: 16 March 2019 / Revised: 6 April 2019 / Accepted: 6 April 2019 / Published: 8 April 2019
PDF Full-text (7595 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Chlormagaluminite is the only Cl-dominated hydrotalcite-supergroup mineral species with M2+:M3+ = 2:1. The holotype sample of chlormagaluminite from the Kapaevskaya volcanic pipe (Irkutsk Oblast, Siberia, Russia) has been chemically and structurally characterized. The average chemical composition of the mineral [...] Read more.
Chlormagaluminite is the only Cl-dominated hydrotalcite-supergroup mineral species with M2+:M3+ = 2:1. The holotype sample of chlormagaluminite from the Kapaevskaya volcanic pipe (Irkutsk Oblast, Siberia, Russia) has been chemically and structurally characterized. The average chemical composition of the mineral is (electron microprobe, OH content is calculated by stoichiometry and H2O from the crystal-structure data, wt. %): MgO 33.85, FeO 1.09, Al2O3 22.07, Cl 14.72, H2Otot 30.96, Cl=O −3.39, total 99.30. The empirical formula based on Mg + Al + Fe = 6 atoms per formula unit (apfu) is [Mg3.91Fe2+0.07Al2.02(OH)12]Cl2.02(H2O)2.0(2). The crystal structure has been solved from single-crystal X-ray diffraction data in the space group P63/mcm, a = 5.268(3), c = 15.297(8) Å and V = 367.6(4) Å3. The refinement converged to R1 = 0.083 on the basis of 152 unique reflections with I > 2σ(I) collected at room conditions. The powder pattern contains standard reflections of a 2H polytype and two additional reflections [(010), d010 = 4.574 Å; (110), d110 = 2.647 Å] indicative of Mg and Al ordering according to the 3 × 3 superstructure. The structure is based upon brucite-type octahedral layers with an ordered distribution of Mg and Al over octahedral sites. The Cl anions and H2O molecules reside in the interlayer, providing a three-dimensional integrity of the structure. Full article
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