Mineral description : Fluoborite

Fluoborite in chondrodite scarn from Tallgruvan. Only as microscopic grains.

Mineral class	Borates : Kotoite - Ludwigite group.
Chemical formula	Mg3(F,OH)3(BO3)
Crystal system	Hexagonal
Habitus	As thin prisms, often in radiating groups.
Cleavage
Hardness	3.5
Density	2.89
Color	Colorless but whitish on weathered surfaces.
Streak
Luster
Description
Occurance
Associates
Notes	Type locality : Tallgruvan, Norberg. Easily weathered into fine fibric to laminar aggregates. Ref : Geijer P. (1926): Norbergite and Fluoborite, two new minerals from the Norberg mining district. Pg 84-85, GFF 48. Fluoborite could be fluorescent in some cases (Franklin, New Yersey).
Locations	A rare mineral. Tallgruvan, Norberg, Västmanland. Occurs in 2-8 mm big prisms or radiating aggregates with ludwigite and chondrodite.

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