CARYOCHROITE IS A RARE MINERAL FROM THE GROUP OF TITANOSILICATES: CRYSTAL STRUCTURE, CRYSTAL CHEMISTRY AND THERMAL PROPERTIES

S. V. Soboleva; Соболева С. В.; N. M. Boeva; Боева Н. М.; P. M. Kartashov; Карташов П. М.; N. S. Bortnikov; Бортников Н. С.

doi:10.31857/S2686739723600339

CARYOCHROITE IS A RARE MINERAL FROM THE GROUP OF TITANOSILICATES: CRYSTAL STRUCTURE, CRYSTAL CHEMISTRY AND THERMAL PROPERTIES

Authors: Soboleva S.V.¹, Boeva N.M.¹, Kartashov P.M.¹, Bortnikov N.S.¹
Affiliations:
1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Issue: Vol 510, No 2 (2023)
Pages: 166-173
Section: MINERALOGY
Submitted: 30.01.2025
Published: 01.06.2023
URL: https://rjmseer.com/2686-7397/article/view/649647
DOI: https://doi.org/10.31857/S2686739723600339
EDN: https://elibrary.ru/UKZBDO
ID: 649647

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Abstract

The crystal structure of rare titanosilicate cariochroite was deternined using X-ray powder and srlected area diffraction data. The crystallochemical formula proposed – [Na(Sr_0.5Ca_0.5)Mg]₃[Fe $_{8}^{3 +}$ Mn( ${Fe}_{0.5}^{2 +} ◻_{0 .5}$ )]₁₀(Ti₂Si₁₂)O₃₇(OH)₁₄(Н₂О)₃. Monoclinic unit cell parameters are: a 16.550(3), b 5.281(2), c 24.25(3) Å, β 93.0°, Z = 2, sp. gr. P2/n. The crystal structure represent the new type of complex Ti–Si–nrt, provided the big volune canals contaning some exchange cations, OH groups and water molecules.

Keywords

titanosilicate, cariochroite, crystal structure, thermal analysis

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