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Abstract <p>One hundred and two samples of helvine, danalite, and genthelvite from 35 locations of various genetic types, as well as two crystals of synthetic analogues of helvine and danalite, have been studied. It is shown that these beryllosilicates (unlike structurally similar sodalite-group aluminosilicates) contain sulfur primarily as S<sup>2–</sup> and a minor <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11969_2025_7491_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{S}}_{2}^{{\bullet {\kern 1pt} - }}\)</EquationSource> <!--BGeoMGU2570052Bulakh-m1--> </InlineEquation> radical anion. The nature of minor Ca and Al in these minerals is considered. It is assumed that the isomorphism involving Al occurs according to the scheme: 2Si<sup>4+</sup> + S<sup>2–</sup> <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11969_2025_7491_Article_IEq2.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\( \to \)</EquationSource> <!--BGeoMGU2570052Bulakh-m2--> </InlineEquation> 2Al<sup>3+</sup> + <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11969_2025_7491_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\square \)</EquationSource> <!--BGeoMGU2570052Bulakh-m3--> </InlineEquation><sup>0</sup>. The Ca admixture is predominantly associated with embedded calcite, fluorite, and calcium garnets.</p>

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New Data on Helvine-Group Minerals: Isomorphic Substitutions, Sulfur Species, and Raman Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • M. O. Bulakh,
  • I. V. Pekov,
  • V. D. Shcherbakov,
  • M. F. Vigasina,
  • A. O. Karpov,
  • N. V. Chukanov

摘要

Abstract

One hundred and two samples of helvine, danalite, and genthelvite from 35 locations of various genetic types, as well as two crystals of synthetic analogues of helvine and danalite, have been studied. It is shown that these beryllosilicates (unlike structurally similar sodalite-group aluminosilicates) contain sulfur primarily as S2– and a minor \({\text{S}}_{2}^{{\bullet {\kern 1pt} - }}\) radical anion. The nature of minor Ca and Al in these minerals is considered. It is assumed that the isomorphism involving Al occurs according to the scheme: 2Si4+ + S2– \( \to \) 2Al3+ + \(\square \) 0. The Ca admixture is predominantly associated with embedded calcite, fluorite, and calcium garnets.