Tysonite is reported from the granite-pegmatite, Jennyhaugen, Drag in Tysfjord, Nordland county, Northern Norway, and from granite-pegmatite at Høydalen, Tørdal in Telemark county, Southem Norway. Optical and X-ray data are given. The parageneses of the two tysonites are described and their genesis is discussed.
Contributions to the mineralogy of Norway. No. 31. Tysonite (fluocerite), a new mineral for Norway.