Hydrothermal Synthesis of Galloepidote—Analogue of Phase Ca2Al2Ga(Si3O12)(OH) from the Tykotlova Gold–Sulfide Occurrence


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Abstract

Abstract—Solid solutions of the epidote–galloepidote series stable at defined PT parameters were synthesized for the first time in order to reconstruct the crystallization conditions of gallium epidote analog Ca2Al2Ga(Si3O12)(OH) from ores of the Tykotlova gold–sulfide occurrence. The unit cell parameters of these phases were calculated and their IR and Raman spectra were obtained. It was concluded that gallium is mainly incorporated into M3 site, which makes it possible to consider the galloepidote as independent mineral species. Stable Ga-bearing aluminosilicate and silicate phases were obtained in the Ca–Ga–Al–Fe–Si–O system (analogs of grossular–andradite garnets and Ca feldspars) as the by-products of synthesis.

About the authors

T. N. Kovalskaya

Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: tatiana76@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

D. A. Varlamov

Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: dima@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

A. R. Kotelnikov

Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: kotelnik@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

N. V. Chukanov

Institute of Problems of Chemical Physics, Russian Academy of Sciences

Author for correspondence.
Email: chukanov@icp.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

G. M. Kalinin

Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: garik@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

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