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The Mineral norbergite

Large Norbergite Crystals in Matrix

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

Properties

Streak
White
Hardness
6 - 6.5
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.

Crystal Habits

As small tabular and prismatic crystals that are usually rounded with pointed terminations. Most often as embedded rounded grains.

Additional Information

Composition
Mg3SiO4(F,OH)2
In Group
Silicates; Nesosilicates; Humite Group
Striking Features
Mode of occurrence and fluorescence.
Environment
In marbles.
Rock Type
Metamorphic

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



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