NORBERGITE

    Class : Silicates
    Subclass : Nesosilicates
    Crystal system : Orthorhombic
    Chemistry : Mg3(SiO4)(F,OH)2
    Rarity : Uncommon

Norbergite is a magnesium silicate belonging to the humite group. Like most minerals in this group, it is found in limestones and dolomites affected by contact metamorphism, mainly metasomatized marbles and skarns, where the intrusion has brought notable quantities of fluorine. Norbergite is associated with magnesium minerals, notably other minerals from the humite group. It was named in reference to its discovery location : Norberg (Sweden). Norbergite is yellow to brown, sometimes pink-purple or white. It rarely forms crystals, classically rounded, of 2.5 cm maximum, it appears mainly in rounded grains.

Main photo : Norbergite from Franklin, New Jersey, USA © Modris Baum

Norbergite in the World

Norbergite is known in blocks of metamorphic limestone thrown up by the Somma and Vesuvius (Italy), and in numerous skarns and similar in the United States (Franklin, New Jersey, Balmat and Edenville, New York). It is also present in several locations in Sweden, Great Britain, Finland and Russia.

Right photos : Norbergite from Franklin, New Jersey, USA © Modris Baum - Medium-wave UV fluorescence


Norbergite in France

Norbergite is not known in the French underground.

Twinning

No twins known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.


Hardness : 6 to 6.5
Density : 3.17
Fracture : Irregular to sub-conchoidal
Streak : White

TP : Translucent to transparent
RI : 1.563 to 1.593
Birefringence : 0.027
Optical character : Biaxial -
Pleochroism : None
Fluorescence : Yellow

Solubility : Acids

Magnetism : ParamagneticRadioactivity : None

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