“In 1889 a very unusual variety ore consisting of redbrown crystals of fluorite with dark cryolite. This specimen comes from this paragnese. The unusual brown colour of the fluorite and cloudy/black cryolite are the result of 0,3% radioactive thorium. The largest fluorite crystal in the lower part of the specimen is 23 mm long. Specimen and photo: OT. Ljøstad.”