Aleksev reported in 2023 that the complex of sulfostannates from the Pravourmiyskoye greisen deposit in the Far East of Russia is discussed. The complex includes stannoidite, mawsonite, stannite, sakuraiite. The discovery and typomorphic features of ferrokesterite and kieserite are noted. Zwitter-tourmalinite metasomatic complexes accompanying the lithium-fluoric granites are distinguished by high ore fertility and lithochalcophilic specialization.
They combine cassiterite, wolframite, sulfides (arsenopyrite, lollingite, chalcopyrite, bornite, sphalerite, pyrrhotine, bismuthinite, etc.) and sulfostannates with an admixture of In, Ag, Cd. It is proposed to use sulfostannates as minerals indicating large-scale formation of rare-metal-tin ore.
The author concluded that the zwitter-tourmalinite complexes accompanying the Li-F granites is characterized by a mixed lithochalcophilic specialization of ores. The presence, species diversity and variable composition of sulfostannates in greisens (ferrokesterite, sakuraiite) and tourmalinite (stannoidite, stannite, mawsonite) have been established.
Then, concerning the mineralogical features of large ore genesis of the Pravourmiyskoye deposit and extrapolate this conclusion to rare-metal-tin deposits associated with lithium-fluoride granites. Ferrokesterite is a likely natural prototype of a new optoelectronic material for converting solar energy into electricity.
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