The M$\stackrel{..}{o}$ssbauer spectra of synthetic mackinawites and tochilinites were recorded. The observed differences in isomeric and quadrupole shift values for the $^{57}$Fe components in the spectra of mackinawite and tochilinite sulfide layers were analyzed. The structure of tochilinite was found to contain equal numbers of conjugate FeS and (Fe, Mg)(OH)$_2$ layers with Mg$^{2+}$ ions present only in brucite layers, largely in one of two observed nonequivalent sites.
$^1$Department of General Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
$^2$Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
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