Muscovite Window from S. V. Obruchev
A well-known geologist, academician S. V. Obruchev visited Yakutia twice. For the first time in 1926, in the Oymyakonsky ulus, he was presented with a muscovite window taken from an old chapel in the town of Sordonnoh. This window is kept in the Central Research Geological Prospecting Museum named after academician F. N. Chernyshev (St. Petersburg). Many people still believe that it was removed from the Zashiversk church. The second time S. V. Obruchev visited Oymyakon in 1930 and wrote that the Sordonnoh chapel burned down in 1929. The muscovite window has its own history, which means that it is necessary to verify the authenticity of the item and to clarify the year the chapel was built.