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Abstract <p>The crystal structure of a high-calcium eudialyte-group mineral from alkaline rocks of the Khibiny massif has been studied. The trigonal unit cell parameters are <i>a</i> = 14.221(1) Å, <i>c</i> = 30.04(1) Å, <i>V</i> = 5261.3(4)&#xa0;Å<sup>3</sup>, sp. gr. <i>R</i>3<i>m</i>. The crystal structure has been refined to a final <i>R</i> = 2.8% in the isotropic approximation of atomic displacement parameters, using 1714 reflections with <i>F</i> &gt; 3σ(<i>F</i>). The studied mineral is similar in chemical composition to feklichevite, but differs from it in the predominance of divalent iron, as well as in a lower calcium content and a higher manganese content. The structural features of calcium-rich eudialyte-group members from three alkaline massifs are discussed.</p>

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New Data on the Isomorphism in Eudialyte-Group Minerals: XIII. Crystal Structure of “Ferrofeklichevite”—a Potentially New High-Calcium Mineral from Khibiny Massif

  • 期刊论文

  • 发表日期：

    2025年12月25日

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  • R. K. Rastsvetaeva,
  • V. M. Gridchina,
  • N. V. Chukanov,
  • S. M. Aksenov

摘要

Abstract

The crystal structure of a high-calcium eudialyte-group mineral from alkaline rocks of the Khibiny massif has been studied. The trigonal unit cell parameters are a = 14.221(1) Å, c = 30.04(1) Å, V = 5261.3(4) Å3, sp. gr. R3m. The crystal structure has been refined to a final R = 2.8% in the isotropic approximation of atomic displacement parameters, using 1714 reflections with F > 3σ(F). The studied mineral is similar in chemical composition to feklichevite, but differs from it in the predominance of divalent iron, as well as in a lower calcium content and a higher manganese content. The structural features of calcium-rich eudialyte-group members from three alkaline massifs are discussed.