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Fredrikssonite

#65609
Fredrikssonite from Långban, Filipstad, Värmland, Sweden - 65609
Fredrikssonite from Långban, Filipstad, Värmland, Sweden - 65609

Fredrikssonite

#65609
Availability
Available
Price
$40.00
Size
1.3 x 0.5 x 0.4 cm - Thumbnail 
Formula
Mg2Mn3+O2(BO3) (RRUFF)
Locality
Långban, Filipstad, Värmland, Sweden

Black needles to 3mm. Only two localities reported thus far; Langban and Nordmark districts. Fredrikssonite is a borate of the Ludwigite group.

Fredrikssonite

Formula
Mg2Mn3+O2(BO3) 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Poor, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
reddish brown 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Hardness
6 

Data courtesy of Webmineral.

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