Mineral deposits of Zavarzin. (a) drop-like particles of native sulfur, a big opal formation is located in the center. (b) gypsum crystals among igneous rock detritus. (c) organomineral aggregate of the benthos microbial communities includes bacterial filaments, diatom shells, detritus of igneous rock from the Uzon caldera, sphere-like pyrite coalescences regions consolidated by opal, and submicron particles of mercury sulfide. (d) sphere-like pyrite coalescences and submicron particles of cinnabar cover the organomineral aggregate of the benthos community.