Formula: (Mg,Mn)2MnBO5
Origin of name: from orthorhombic and pinakiolite
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: black
Diaphaneity: opaque
Luster: metallic
Habit: crystals thin rectangular platelets, rare short prismatic, often bent or broken
Hardness: 6
Specific gravity: 4.03
Cleavage: 1; {010} good
Tenacity:
Streak: brownish gray
Synonyms/varieties:
Comments: polymorphous with fredrikssonite, pinakiolite and takeuchiite
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