New Data on the Isomorphism in Eudialyte-Group Minerals. VIII: Crystal Structure of the Fe2+-Analog of Feklichevite, a Potentially New Mineral from the Khibiny Massif

Rastsvetaeva R. K.; Chukanov N. V.; Sipavina L. V.; Voronin M. V.

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New Data on the Isomorphism in Eudialyte-Group Minerals. VIII: Crystal Structure of the Fe2+-Analog of Feklichevite, a Potentially New Mineral from the Khibiny Massif

机译：eudiyte-group矿物质中同构的新数据。 VIII：Fe2 + -Analog的Feklichevite的水晶结构，来自Khibiny Massif的潜在新的矿物质

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A potentially new calcium-rich eudialyte-group mineral from the Khibiny massif has been investigated by X-ray diffraction (XRD) analysis. The trigonal unit-cell parameters are found to be as follows: a = 14.221(1) angstrom, c = 30.04(1) angstrom, and V = 5261.3 angstrom(3); sp. gr. R3m. The crystal structure is refined to the final reliability factorR= 2.8% in the anisotropic approximation of atomic displacements, using 1714 reflections withF > 3 sigma(F). The idealized formula of the mineral (Z = 3) is (Na12Ca3)Ca6FeZr3NbSi25O75(H2O,OH,F,Cl)(3.)The dominance of divalent iron form is confirmed by Mossbauer spectroscopy data. The closest analog of the mineral under study is feklichevite from the Kovdor alkaline massif; the main difference is the dominance of divalent iron over trivalent iron in the former.

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《Crystallography reports》 |2020年第5期|共7页
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Rastsvetaeva R. K.; Chukanov N. V.; Sipavina L. V.; Voronin M. 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 Korzhinskii Inst Expt Mineral Chernogolovka 142432 Moscow Oblast Russia;

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

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正文语种 eng
中图分类晶体学;
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New Data on the Isomorphism in Eudialyte-Group Minerals. VIII: Crystal Structure of the Fe2+-Analog of Feklichevite, a Potentially New Mineral from the Khibiny Massif

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