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Norbergite with Phlogopite and Graphite

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
Composition Mg3SiO4(F,OH)2
Color Yellow, orange, brown
Streak White
Hardness 6 - 6.5
Crystal System Orthorhombic
Crystal Forms
and Aggregates
As small tabular and prismatic crystals that are usually rounded with pointed terminations. Most often as embedded rounded grains.
Transparency Transparent to translucent
Specific Gravity 3.1 - 3.2
Luster Resinous, vitreous
Cleavage 3,1
Fracture Subconchoidal to uneven
Tenacity Brittle
Other ID Marks Strongly fluorescent bright yellow in shortwave ultraviolet light.
In Group Silicates; Nesosilicates; Humite Group
Striking Features Mode of occurrence and fluorescence.
Environment In marbles.
Rock Type Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2


Norbergite AUCTIONS



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.

COMMON MINERAL ASSOCIATIONS
Calcite, Diopside, Phlogopite, Tremolite, Wollastonite, Graphite, Spinel



norbergite PHOTOS
 
ADDITIONAL RESOURCES
 
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