A. V. Epimakhov
South Ural State University
Russian Federation

76 Lenin av., Chelyabinsk 454080

I. V. Chechushkov
South Ural State University
Russian Federation

76 Lenin av., Chelyabinsk 454080

D. V. Kiseleva
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation

15 Academician Vonsovsky st., Ekaterinburg 620110

M. N. Ankushev
South Urals Federal Research Center of Mineralogy and Geoecology, UB RAS, Institute of Mineralogy
Russian Federation

Ilmeny Reserve Area, Miass, Chelyabinsk region 456317

P. S. Ankusheva
South Urals Federal Research Center of Mineralogy and Geoecology, UB RAS, Institute of Mineralogy; South Ural State Humanitarian Pedagogical University
Russian Federation

Ilmeny Reserve Area, Miass, Chelyabinsk region 456317;

69 Lenin av., Chelyabinsk 454080