Crystal Structure, Mineralogy, and Geochemistry of Scapolite

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: 26 July 2024 | Viewed by 610

Special Issue Editors


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Guest Editor
Department of Civil Engineering, European Polytechnical University, Sv. Kiril i Metodiy Str. 23, 2300 Pernik, Bulgaria
Interests: mineralogy; crystallography; metallurgy; material science

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Guest Editor
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
Interests: crystallography; mineralogy

Special Issue Information

Dear Colleagues,

Minerals of the scapolite group (“scapolites” below) are common rock-forming aluminosilicates that occur in a wide variety of metamorphic and altered igneous rocks. Their wide distribution in metamorphic terrains, as well as their high stability over a wide range of pressures and temperatures, make them potential geothermometers and geobarometers. The volatile components in scapolites indicate that they may play a natural role in the capture and storage of greenhouse gases.

Scapolites have well-pronounced crystal chemical complexity, and some questions in this field of study have not yet found an unequivocal answer. Among the most important questions in this regard are those related to the elucidation of possible isomorphic substitutions in scapolite solid solutions, the relationship between chemical composition and crystal structure characteristics (choice of space group, presence or absence of phase transitions, antiphase boundaries), and the classification of the members of this group.

This Special Issue aims to present new mineralogical, geochemical, and structural studies on scapolites, as well as to provide an arena for collaboration and knowledge exchange between authors working with this fascinating group of minerals. We encourage submissions that present fundamental and applied research extending the current understanding of scapolite mineralogy.

Dr. Milen Kadiyski
Prof. Dr. Vladislav Kostov-Kytin
Guest Editors

Manuscript Submission Information

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Keywords

  • scapolite group
  • marialite–melonite series
  • Si-Al ordering
  • crystal structure
  • X-ray diffraction
  • Raman spectroscopy

Published Papers (1 paper)

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Research

25 pages, 6966 KiB  
Article
Further on the Choice of Space Group for Scapolite Group Members and Genetic Considerations about the Si-Al Ordering in Their Framework Construction
by Vladislav Kostov-Kytin, Milen Kadiyski and Rositsa Nikolova
Minerals 2024, 14(6), 556; https://doi.org/10.3390/min14060556 - 28 May 2024
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Abstract
This paper poses a major question regarding the choice of space group for scapolite mineral group members. An artificial boundary is typically drawn between space groups I4/m and P42/n when solving the structures of scapolites within the [...] Read more.
This paper poses a major question regarding the choice of space group for scapolite mineral group members. An artificial boundary is typically drawn between space groups I4/m and P42/n when solving the structures of scapolites within the marialite–meionite series. The authors debate if solving the crystal structure in lower symmetries is justified. The choice of space group here is attributed to Si-Al ordering of the framework, and it is shown that the interstitial framework cations and anions have an accompanying role in that decision. Some answers on the ranges and limits of distribution of space groups of scapolite members in the marialite–meionite series, and the manifestations of violation of the Lowenstein rule or the so-called aluminum avoidance rule are presented. Modern physical methods (SEM-EDS and SXDA) are employed in the study to properly analyze the solid solution series in detail. New crystal–chemical data are reported for scapolite samples from different localities. An analysis was made for the types of possible Al-O-Al bonds that can occur in the structures at different Al:Si ratios and their influence on Al-Si ordering. Finally, genetic considerations about Al-Si ordering in the framework construction during the mineral formation processes are proposed. Full article
(This article belongs to the Special Issue Crystal Structure, Mineralogy, and Geochemistry of Scapolite)
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