The Mineral norbergite
Norbergite is a member of the
humite group, and is most distinguished from other members by its
fluorescence. Norbergite is named after the locality of Norberg, Sweden, where this mineral was first described.
Chemical Formula
Magnesium fluoro-hydroxyl-silicate
Color
Yellow, orange, brown
Crystal System
Orthorhombic
Crystal Habits
As small tabular and prismatic crystals that are usually rounded with pointed terminations. Most often as embedded rounded grains.
Uses
Norberite is used as a collectors mineral, mostly for collectors specializing in fluorescent minerals.
Noteworthy Localities
Norbergite is not a common mineral and is found only in a limited amount of localities worldwide. The type locality where this mineral was first described is the Östanmossa mine, Norberg, Västmanland, Sweden. The marbles of Mogok, Burma (Myanmar) have produced large gemmy crystals of Norbergite.
The Franklin
marble district in New Jersey has produced some of the best collectible examples of this mineral, especially at the Limecrest Quarry, Sparta, Sussex Co., where it formed in well-shaped, flesh-colored crystals. Norbergite is one of the important
fluorescent minerals from the Franklin Mine, Sussex Co., New Jersey, where it formed in yellow to brown embedded grains. A new housing development on Whispering Woods Lane behind the Sterling Hill Mine in Ogdensburg, New Jersey, had produced a one-time find of good Norbergite during an excavation. Norbergite has also been found across the border in Amity, Orange Co., New York.