Fredrikssonite

minerals

adelite

hausmannite

jacobsite

Images

Formula: Mg2Mn3+O2(BO3)
Anhydrous borate, ludwigite group
Specific gravity: 3.84
Hardness: 6
Streak: Yellowish brown
Colour: Reddish brown
Environments

Metamorphic environments

Localities

At the type locality, Långban, Filipstad, Värmland County, Sweden, fredrikssonite occurs in dolomite in a metamorphosed iron-manganese orebody. It has been found here in two assemblages. In one sample it was associated with calcite, adelite, brucite and hausmannite; in another sample it was found with clinohumite, calcite and jacobsite (AM 71.227).

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