A set of unique melted rocks so called paralavas was found within the limits of ancient combustion metamorphic complexes of the Kuznetsk coal basin. Their chemical and mineral compositions have no analogues among abyssal rocks. The main mineral constituents of paralavas are Fe-rich K-bearing cordierite, Al-bearing tridymite, high-aluminous clinopyroxenes, basic plagioclases, fayalite, hercynite-magnetite. The principal difference between combustion metamorphic rocks and sanidinite facies rocks is the intensive melting of metapelites, as well as other silicate protoliths. This process is completed by the formation of calcium-rich and ferrous-rich high-silica or basic paralavas. Commonly, these rocks are extremely heterogeneous on a scale of tens to hundreds of micrometers and are characterized by an unusual mineral composition, including the presence of various glasses.