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Synthesis of Fe-deficient eudialyte analogues: Relationships between the composition of the reaction system and crystal-chemical features of the products

Published online by Cambridge University Press:  13 January 2023

Tatiana N. Kovalskaya Open the ORCID record for Tatiana N. Kovalskaya [Opens in a new window] ,
Vera N. Ermolaeva Open the ORCID record for Vera N. Ermolaeva [Opens in a new window] ,
Nikita V. Chukanov ,
Dmitry A. Varlamov Open the ORCID record for Dmitry A. Varlamov [Opens in a new window] ,
Georgy A. Kovalskiy Open the ORCID record for Georgy A. Kovalskiy [Opens in a new window] ,
Egor S. Zakharchenko Open the ORCID record for Egor S. Zakharchenko [Opens in a new window] ,
Georgy M. Kalinin  and
Korney D. Chaichuk
Tatiana N. Kovalskaya*
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia
Vera N. Ermolaeva
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia Vernadsky Institute of Geochemistry and Analytical Chemistry the Russian Academy of Sciences (GEOKHI RAS), 19 Kosygin str., Moscow, 119991 Russia
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics the Russian Academy of Sciences (IPCP RAS) Ac. Semenov avenue 1, Chernogolovka, Moscow region, 142432 Russia
Dmitry A. Varlamov
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia Institute of Problems of Chemical Physics the Russian Academy of Sciences (IPCP RAS) Ac. Semenov avenue 1, Chernogolovka, Moscow region, 142432 Russia
Georgy A. Kovalskiy
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia
Egor S. Zakharchenko
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia
Georgy M. Kalinin
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia
Korney D. Chaichuk
Affiliation:
D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences (IEM RAS), 4 Academician Ossipyan str., Chernogolovka, Moscow District, 142432 Russia
*
*Author for correspondence: Tatiana N. Kovalskaya, Email: tatiana76@iem.ac.ru
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Abstract

Eudialyte-related compounds have been synthesised hydrothermally at T = 600°C and P = 2 kbar from a stoichiometric mixture of Na2CO3, CaO, Fe2O3, ZrOCl2 and SiO2 using the Na:Ca:Fe:Zr:Si ratios corresponding to the eudialyte end-member Na15Ca6Fe3Zr3Si(Si25O73)(OH)Cl2⋅H2O, in the presence of 1 M aqueous solutions of NaCl and NaF. The synthesis was carried out in platinum ampoules over 10 days. Natural raslakite (a Ca-deficient member of the eudialyte group) was used as a seed and added in amounts corresponding to 2 wt.% of the whole charge. The products were characterised by powder X-ray diffraction, IR and Raman spectroscopy, morphological features, and electron probe microanalyses. In experiments with NaCl, almost pure eudialyte-type compounds were obtained. Synthesis in the presence of a NaF solution resulted in the formation of a F-dominant eudialyte-type compound related to raslakite as the main product and aegirine, vlasovite and lalondeite as by-products. All synthesised eudialyte-type compounds are Zr-rich and Fe-deficient, similar to eudialyte-group minerals from hyperagpaitic rocks related to foyaites. The increased NaCl contents in the reaction system results in increased Ca content in the synthesised eudialyte-related compounds. The crystal-chemical formulae of the synthesised eudialyte-type compounds are derived based on general regularities established earlier for eudialyte-group minerals.

Keywords

eudialytehydrothermal synthesiscrystal chemistryperalkaline complexes
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 2 , April 2023 , pp. 233 - 240
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

†

Deceased

Associate Editor: Katharina Pfaff

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