1. Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
2. Department of Crystallography, Saint-Petersburg State University, University emb. 7/9, St. Petersburg, 199034, Russia
3. Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Murmansk Region, 184200, Russia
4. Department of Mineral Deposits, Saint-Petersburg State University, University emb. 7/9, St. Petersburg, 199034, Russia