Polychrome cancrinite-vishnevite crystal was found in alkali nepheline-feldspar pegmatites of the Kurochkin Log occurrence from the Vishnevye Mountains in the Southern Urals. A crystal 15 mm in size exhibits a gradual transition from early yellow zones of S-bearing cancrinite (Na5.32 CaJD(AlSiO)(CO(SO · 3HO to late blue zones of vishnevite (NaCaK□) 0.89 )6.21 6.07 5.93 24 3)0.59 4)0.41 2 6.27 0.06 0.31 6.64 (Al5.99Si6.01O24)(SO4)0.99 (CO3)0.01 · 3H2O.

Figures 2. Table 1. References 6.

Key words: cancrinite, vishnevite, alkali pegmatites, Vishnevye Mountains, Urals.

V.A. Popov,  Institute of Mineralogy, UB RAS, 456317, Russia, Miass, Ilmen State Reserve; popov@mineralogy.ru;

V.I. Popova, Institute of Mineralogy, UB RAS, 456317, Russia, Miass, Ilmen State Reserve

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