Synthetic phases of eudialyte composition

Авторы: Kovalskaya T.N., Ermolaeva V.N., Chukanov N.V., Varlamov D.A., Kovalskiy G.A., Kalinin G.M., Chaychuk K.D.
Журнал: Experiment in GeoSciences
Том: 28
Номер: 1
Год издания: 2022
Первая страница: 81
Последняя страница: 84
Аннотация: Minerals, synthetic analogs of eudialyte, weresynthesized hydrothermally at T = 600°C and P = 2 kbar from a stoichiometric mixture of Na2CO3, CaO, Fe2O3, ZrOCl2, and SiO2 with Na:Ca:Fe:Zr:Si corresponding to the end member of eudialyte Na15Ca6Fe3Zr3Si(Si25O73 )(OH)Cl2 H=O, in the presence of 1M aqueous solutions of NaCl andNaF. Natural raslakite was added as a seed in an amount of 2 wt.% of the total mixture. The products were characterized by X-ray powder diffraction, IR and Raman spectroscopy, and electron probe microanalysis. Almost pure compounds of the eudialyte type were obtained in experiments with NaCl. Synthesis in the presence of a NaF solution led to the formation of an F-dominant eudialytetype compound, intergrown with raslakite as the main product and aegirine, vlasovite, and lalondeite as side products. All synthesized eudialytes are rich in Zr and deficient in Fe, as are the minerals of the eudialyte group from hyperagpaitic rocks related to foyaites.
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