Barylite was first found in some nepheline-syenite pegmatites in a nepheline syenite dike in the Lågen Valley, near the famous Langesundfjord district, within the Igneous Rock Complex of the Oslo Region. Subsequently, barylite was found in one old sample from one of the nepheline-syenite pegmatites in the Langesundfjord area. The paragenesis of the barylites is treated in some detail. The results of optical and spectrochemical determinations are given.
Contributions to the mineralogy of Norway. No. 35. The first occurrences of the rare mineral barylite, Be2BaSi2O7, in Norway.