Geology of Ore Deposits, 2020, V 62, N 7.

The Symmetry Statistics of Mineral Species in 
Various Thermodynamic Environments
S. K. Filatov 
p. 547  

Granite Systems with Rare-Metal Pegmatites
S. M. Beskin and Yu. B. Marin 
p. 554  

The Niz’yavr Alkaline Pluton: Age, Isotope 
Characteristics, and Rare-Metal Mineralization
M. N. Petrovskiy 
p. 564  

The Lu–Hf Isotope Composition of Zircon from 
Syenites of the Saharjok Alkaline Massif, Kola Peninsula
V. R. Vetrin and E. A. Belousova 
p. 574  

Modeling of Mineral Parageneses and Thermobarometry 
of Metavolcanic Rocks of the Ruker Group in the 
Southern Prince Charles Mountains, East Antarctica
Yu. L. Gulbin and E. V. Mikhalsky 
p. 584  

New Minerals Belogubite, a New Mineral of the Chalcanthite Group from the Gaiskoe Deposit, South Urals, Russia A. V. Kasatkin, S. N. Britvin, N. V. Chukanov, R. Škoda, A. A. Agakhanov and D. I. Belakovskiy p. 599 Deltalumite, a New Natural Modification of Alumina with a Spinel-Type Structure I. V. Pekov, I. P. Anikin, N. V. Chukanov, D. I. Belakovskiy, V. O. Yapaskurt, E. G. Sidorov, S. N. Britvin and N. V. Zubkova p. 608
Minerals and Mineral Parageneses The Mineral Composition of Paleoproterozoic Metamorphosed Massive Sulfide Ores in the Kola Region (A Case Study of the Bragino Ore Occurrence, Southern Pechenga) A. A. Kompanchenko, A. V. Voloshin and A. V. Bazai p. 618 Wolframoixiolite in Lithium–Fluorine Granites of the Arga–Ynnakh–Khaya Pluton, Yakutia V. I. Alekseev, Yu. B. Marin and O. L. Galankina p. 629 Chevkinite-(Се) and Perrierite-(Се) from the Island Arc Quartz Gabbronorite–Dolerite of the Ayu-Dag Intrusion, Crimean Mountains E. M. Spiridonov, S. V. Filimonov, E. S. Semikolennykh, N. N. Korotaeva and N. N. Krivitskaya p. 638 Chrome Spinels in Carbonate Veins of the Onguren Complex, Western Baikal Region V. B. Savelyeva, E. P. Bazarova and E. A. Khromova p. 652 Agates from Paleoproterozoic Volcanic Rocks of the Onega Structure, Central Karelia E. N. Svetova and S. A. Svetov p. 669