Formula: (Mg,Mn)2(Mn,Sb)BO5
Origin of name: from Greek for small tablet
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: black
Diaphaneity: opaque
Luster: brilliant metallic, dull on prism faces
Habit: crystals thin tabular, rectangular outline, short prismatic, rare, crystals may be broken or bent
Hardness: 6
Specific gravity: 3.88
Cleavage: 1; {010} good
Tenacity:
Streak: brownish gray
Synonyms/varieties:
Comments: polymorphous with fredrikssonite, orthopinakiolite and takeuchiite
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