A pioneer hydrothermal synthesis of a silver aluminosilicate has been performed at 600 degrees C and 1.3 kbar in Physical and Chemical Modeling Laboratory of the Institute of Mineralogy and Petrography SB RAS, Novosibirsk, Russia. The synthesized Ag-bearing aluminum silicate has the Ag(LiAl)[AlSi3(O-8(OH)(2))]F-2 chemical furmula. Its X-ray study showed that it could be regarded a dioctahedral mica. Argentum ions enter interlayer sites in the mica crystal structure. The unit-cell parameters are as follows: a = 5.205(4), b = 9.013(8), c = 19.361(18) angstrom, beta = 97.78(13)degrees, V = 900(1)angstrom(3). The synthesized Ag-bearing mica can be regarded an experimental proof for a possibility of existence of Li-bearing dioctahedral micas. (c) 2006 Springer Science + Business Media, Inc.