A rare Ba and REE fuorocarbonate kukharenkoite-(Ce) Ba2Ce(CO3)3F with empirical formula (Ba1.88Sr0.17)2.05(Ce0.53La0.31Nd0.11)0.95(CO3)3F was found in alkali pegmatite of vein no. 35 in the Vishnevye Mountains, South Urals. Kukharenkoite-(Ce) forms small inclusions up to 3–7 µm in anatase and quartz. Raman spectrum of the studied kukharenkoite-(Ce) is similar to spectrum no. R110190 of kukharenkoite-(Ce) from the RRUFF database. The mineral assemblage of pegmatite from vein no. 35 includes feldspars, annite, yangzhuminite (?), aegirine, magnesio-fuoro-arfvedsonite, allanite-(Ce), ilmenite, monazite-(Ce), anatase, rutile, brookite, titanite, pyrite, molybdenite, calcite, zircon, pyrochlore, and REE carbonates – bastnäsite-(Ce), parisite-(Ce), synchisite-(Ce), röntgenite-(Ce) and huanghoite-(Ce). Kukharenkoite-(Ce) and, mostly likely, yangzhumingite KMg2. 5[Si4O10]F2 are found for the frst time in the Urals.

Keywords: kukharenkoite-(Ce), yangzhumingite, alkali pegmatite, vein no. 35, Vishnevye Mountains, Southern Urals, Russia

Received 28.08.2021, accepted 28.09.2021

V.I. Popova, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, institute of Mineralogy, Miass, Chelyabinsk oblast, 456317 Russia; popov@mineralogy.ru

M.A. Rassomakhin, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, institute of Mineralogy, Miass, Chelyabinsk oblast, 456317 Russia;

V. A. Popov, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, institute of Mineralogy, Miass, Chelyabinsk oblast, 456317 Russia;

A.M. Kuznetsov, ul. Oktyabrskaya, 5-337, Chelyabinsk, 454071 Russia

S.M. Lebedeva, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, institute of Mineralogy, Miass, Chelyabinsk oblast, 456317 Russia

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