In some nepheline syenites and related pegmatites.
IMA Status:
Valid Species (Pre-IMA) 1887
Locality:
From Lille Aro Island and Skudesundskjaer, near Brevik, Langesundsfjord, and Bratthagen, north of Larvik, Norway. Link to MinDat.org Location Data.
Name Origin:
Named for Carl Harry F. Rosenbusch (1836-1914), German geologist and mineralogist, Heidelberg, Germany.