Produced by late-stage crystallization of alkalic nepheline syenite magmas in pegmatites in differentiated alkalic massifs. Hydrous manganese phyllosilicate.
Approved IMA 1982
On Mts. Rasvumchorr, Niorkpakhk, Koashkar, and Koashva, Khibiny massif, and at the Jubilee pegmatite, Mt. Karnasurt, and several other localities in the Lovozero massif, Kola Peninsula
Link to MinDat.org Location Data.
Named for Ilarion Ilarionovich Shafranovskii (1907-1994), mineralogist and crystallographer at the Mining Institute, St. Petersburg, Russia.