New Data on the Isomorphism in Eudialyte-Group Minerals. IV: Modular Structure of Titanosilicate with Replacement of Na by Mn in the Alluaivite Module


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A new modular eudialyte-group mineral—titanosilicate—from the Lovozero massif has been investigated using X-ray diffraction. The trigonal-cell parameters are found to be a = 14.069(4) Å, c = 60.63(1) Å, and V = 10393(1) Å3; sp. gr. R\(\bar {3}\)m. The crystal structure is refined to final reliability factor R = 5.6% in the anisotropic approximation of atomic displacements using 1210F > 3σ(F). The idealized mineral formula (Z = 3) is Na28Ca12[Na4.6][Mn1.4]Ti6[Si52O132(О,OH)16](H2O)3.5Cl1.5. The problems of the modular representatives of the group at the Zr–Ti isomorphism in the framework site and the Na–Mn isomorphism in the alluaivite module М2 sites are discussed.

作者简介

R. Rastsvetaeva

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Russian Academy of Sciences

编辑信件的主要联系方式.
Email: rast@crys.ras.ru
俄罗斯联邦, Moscow, 119333

K. Viktorova

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Russian Academy of Sciences

Email: rast@crys.ras.ru
俄罗斯联邦, Moscow, 119333

S. Aksenov

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Russian Academy of Sciences

Email: rast@crys.ras.ru
俄罗斯联邦, Moscow, 119333

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