TY JOUR TI Genetic types of corundum KW noble corundum KW genesis KW magmatism KW metamorphism KW Precambrian JO Vestnik of geosciences AU Schipcov, V.V. AU Barnov, N.G. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"