New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte-Sergevanite Series Mineral from the Lovozero Alkaline Massif

Rastsvetaeva R. K.; Chukanov N. V; Van K. V.

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New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte-Sergevanite Series Mineral from the Lovozero Alkaline Massif

机译：New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte-Sergevanite Series Mineral from the Lovozero Alkaline Massif

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An intermediate member of the eudialyte-sergevanite solid-solution series has been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigonal unit-cell parameters of the mineral are found to bea= 14.1944(4) angstrom,c= 30.294(1) angstrom, andV= 5286.0(3) angstrom(3); sp. gr.R3. The crystal structure is refined to the final reliability factorR= 4.48% in the anisotropic approximation of atomic displacements, using 2420 reflections withF> 3 sigma(F). The idealized formula of the mineral (Z= 3) is Na14Sr(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)(3)Cl center dot H2O. An increase in the Ca and Fe contents in comparison with the holotype sergevanite does not increase symmetry. The problems of genesis of calcium-poor minerals with eudialyte-type structure are discussed.

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《Crystallography reports》 |2020年第4期|554-559|共6页
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Rastsvetaeva R. K.; Chukanov N. V; Van K. V.;
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Russian Acad Sci, Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Moscow 119333, Russia;

Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia;

Russian Acad Sci, Inst Expt Mineral, Chernogolovka 142432, Moscow Oblast, Russia;

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中图分类晶体学;
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New Data on the Isomorphism in Eudialyte-Group Minerals. VII: Crystal Structure of the Eudialyte-Sergevanite Series Mineral from the Lovozero Alkaline Massif

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