Work

Iowaite from the Udachnaya kimberlite pipe (Yakutia): crystal chemistry and post-crystallization transformations

Year: 2024

Type: article

Abstract: An unusual variety of iowaite, characterized by an anomalously low content of divalent cations: (Mg+Fe2+)/Fe3+ ~2.75:1, was identified as part of the late hydrothermal mineral association in the Udachnaya kimberlite pipe (Yakutia). Its crystal structure was studied on a single crystal: polytype 3R, sp. gr. R3 ̅m, a = 3.1213(3), c = 23.621(4) Å, V = 199.30(5) Å3; R1 = 0.027. In some crystals, zoning has been revealed, indicating natural anion exchange with the main reactions 2Cl– → SO42– and 2Cl– → 2SO42– + Ca2+. This is the first reliably recorded case of natural anion exchange in minerals of the hydrotalcite supergroup. The anion exchange reaction occurs with an increase in the interlayer distance from 8.0 to 11.2 Å. The composition and character of zoning of the studied crystals provides information about the evolution of the chemistry of late low-temperature processes.

Source: Доклады РОССИЙСКОЙ АКАДЕМИИ НАУК Науки о Земле

DOI: 10.31857/s2686739724070123

Authors: E. S. Zhitova, D. S. Mikhailenko, I. V. Pekov, A. V. Korsakov, A. A. Zolotarev

Institutions: Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Ural Branch of the Russian Academy of Sciences, Zavaritsky Institute of Geology and Geochemistry, Lomonosov Moscow State University

Language: English

Topic: Layered Double Hydroxides Synthesis and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

OpenAlex ID: W4405351388

FWCI:

Cites: 9

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Related to: 10