Corundum crystals with rims of spinel and a wide spectrum of inclusions are studied from actinolite-mica veins in altered ultramafc rocks located among metaterrigenous rocks of the Ilme-ny-Vishnevogorsk polymetamorphic complex. In total, 32 minerals are identifed including ames-ite Mg2Al(AlSiO5)(OH)4, baddeleyite ZrO2, gersdorfte NiAsS, dissacisite-(Ce) (CaCe)(Al2Mg) (Si2O7)(SiO4)O(OH), and nickeline NiAs, which were found for the frst time in the Ilmeny Mountains. The formation of various inclusions in corundum is related to the infuence of high-Al fuid enriched in alkali elements, REEs, rare metals, and Ba during tectono-metamorphic activation of the complex.

Figures 6. Tables 8. References 7.

Key words: corundum, sapphire, spinel, inclusions, dissakisite-(Ce), baddeleyite, Ilmeny Mountains.

M.A. Rassomakhin, Ilmen State Reserve, Miass, Chelyabinsk district, 456317 Russia; Miha_Rassomahin@mail.ru

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

1. Azimov P.Ya., Bushmin S.A. (2007) [Solubility of minerals of metamorphic and metasomatic rocks in hydro-thermal solutions of varying acidity: thermodynamic modeling at 400-800 °C and 1-5 kbar]. Geokhimiya [Geochemistry International], (12), 1210-1234.
2. Hogarth D.D. (1977) Classifcation and nomenclature of the pyrochlore group. American Mineralogist, 62, 403–410.
3. Koptev-Dvornikov V.S., Kuznetsov E.A. (1931) [Bor-zovskoe corundum deposit: petrological study]. Moscow, Tekhizdat, 318 p. (in Russian)
4. Krasnobaev A.A., Valizer P.M., Anflogov V.N., Med-vedeva E.V., Busharina S.V., Murdasova N.M. (2016) [Zirconology of serpentinites from Nyashevo massif (Southern Urals)]. Doklady Earth Sciences, 471(2), 1298-1302.
5. Levitsky V.I. (2005) [Petrology and geochemistry of metasomatism during formation of the continental crust]. Novosibirsk, GEO, 340 p. (in Russian)
6. Nikandrov S.N., Rassomakhin M.A., Nishanbaev T.P. (2017) [List of minerals of the Ilmeny mountains (data for 2017)]. Mineralogiya [Mineralogy], 3 (1), 52-60. (in Russian)
7. Polyakov V.O., Bazhenov A.G., Petrov V.I. (1991) [Mineral assemblages of corundum of the Ilmeny Mountains]. Mineral’nye assotsiatsii korunda Il’mernskikh gor. Novyye dannyye po mineralogii endogennykh mestorozh-deniy i zon tekhnogeneza Urala [New data on mineralogy of endogenic deposits and zones of technogenesis of the Urals]. Sverdlovsk, UB RAS USSR, 15-21. (in Russian).