The minerals of the pyrochlore group are abundant in rocks of the Vishnevogorsk alkaline complex – miaskites, mica rocks, carbonatites, and their pegmatites. Several generations of pyrochlore can be found in complex pegmatite bodies. According to the current nomenclature, fuorcal-ciopyrochlore, oxycalciopyrochlore, oxynatropyrochlore, oxycenopyrochlore, oxyuranpyrochlore, and hydrocal ciobetafte are identifed among of minerals of the pyrochlore group of the Vishnevye Mountains. Their chemical composition is diferent in both the individuals (zoning) and diferent pegmatites. The pyrochlore crystals exhibit the variable composition, the traces of deformation, metasomatosis, metamictization, exsolution structures, as well as inclusions of other minerals.

Figures. 9. Tables 5. References. 24.

Key words: minerals of the pyrochlore group, alkali pegmatites, Vishnevye Mountains, Southern Urals.

V.I. Popova, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; popov@mineralogy.ru

V.A. Popov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia;

I.A. Blinov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia;

V.A. Kotlyarov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia

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