Banalsite–stronalsite from sandyites of the ilmenogorsky Miaskite massif (South Ural)
E.V. Medvedeva, A.B. Nemov, V.A. Kotlyarov
UDК 549(1); 552.13
The minerals of the banalsite BaNa2(Al2Si2O8)2–SrNa2(Al2Si2O8) stronalsite series were found for the first time in alkaline rocks of the Ilmenogorsky miaskite massif. Banalsite contains 11.97– 12.86 wt. % ВаO and 5.44–5.56 wt. % SrO. Stronalsite was found in the rim of the banalsite grain and contains 8.08 wt. % SrO and 8.18 wt. % ВаO. These minerals are characterized by the presence of lisetite minal CaNa2[Al2Si2O8]2 potassium and iron. Their formation is related to the late metasomatic alteration of alkaline rocks.
Figures 6. Table 1. References 10.
Key words: banalsite, stronalsite, sandyites, Ilmenogorsky miaskite massif.
MINERALOGY № 1 2016