Grains of brown/yellow Norbergite on white Franklin marble, from the Sterling Mine, Sterling Hill, Ogdensburg, Sussex Co., New Jersey. Under short wave UV (254nm) the Norbergite fluoresces pale yellow and the Franklin marble a dim blue/purple. The size of this specimen is 15.2 x 10.2 x 7.6 cm, and it weighs 3.31 lbs.
