Formula: Mg2(Mn,Fe)BO5
Origin of name: For Kurt A. Fredriksson, American mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Reddish brown, black
Diaphaneity: Transparent
Luster: Vitreous
Habit:
Hardness: 6
Specific gravity: 3.84
Cleavage: 2; Poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: Polymorphous with orthopinakiolite, pinakiolite and takeuchiite
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