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

Kovalskaya, T.N.; Ermolaeva, V.N.; Chukanov, N.V.; Varlamov, D.A.; Kovalskiy, G.A.; Zakharchenko, E.S.; Kalinin, G.M.; Chaichuk, K.D.

Авторы: Kovalskaya T.N., Ermolaeva V.N., Chukanov N.V., Varlamov D.A., Kovalskiy G.A., Zakharchenko E.S., Kalinin G.M., Chaichuk K.D.
Журнал: Mineralogical Magazine
Том: 87
Год издания: 2023
Издательство: Mineralogical Society
Местоположение издательства: United Kingdom
Первая страница: 233
Последняя страница: 240
DOI: 10.1180/mgm.2023.1
Аннотация: 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.
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Synthesis of Fe-deficient eudialyte analogues: Relationships between the composition of the reaction system and crystal-chemical features of the productsстатья Исследовательская статья

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