To Professor Ivar Oftedal with kindest regards and congratulations on the occasion of his 70th birthday.

Introduction
Routine X-ray powder examination of unidentified material in the collections of Mineralogisk-Geologisk Museum in Oslo proved the existence of pyrophanite in specimens from the nepheline syenite pegmatites in the Langesund-fiord area. Pyrophanite can therefore be added to the long list of minerals from those famous deposits. (Brøgger 1890 and Neumann 1960).