Indium-containing metal-carbon composites from volcano-fumarole mineralization of Great fissure Tolbachik eruption

The results of studies of metal-carbon composites, unique in composition and origin, in which the metal component is a tinaluminum alloy with an admixture of In, Cu, Fe, Cr, Se, are discussed. The morphology and internal structure of particles, variations in the chemical composition, and the isotopic of carbon impurities are analyzed. Based on the diagram of the eutectic type, a conclusion was made about the crystallization of alloys in the temperature range 650—150 °С. The question of the indium content of volcanic products in Kamchatka as a new and possibly industrially promising type of phase-diverse indium mineralization is discussed.