In aegirine-arfvedsonite-microcline pegmatites in dunites (Inagli massif, Russia).
IMA Status:
Approved IMA 1960
Locality:
From the Ingali massif, 30 km west of Aldan; the Murun massif, southwest of Olekminsk, Yakutia; and on Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.