Formula: NaMnSi2O6
Origin of name: from elements in composition
Crystal system: monoclinic
Crystal class: 2/m
Twinning: Simple on {100}, polysynthetic
Unit cell: a = 9.513, b = 8.615, c = 5.356, β = 105.12°
Colour: Dark red to orange-red
Diaphaneity: Transparent
Luster: Vitreous to pearly on cleavage
Habit: Equant to elongated grains, prisms
Hardness: 6 to 7
Specific gravity: 3.60
Cleavage: 1; {110} cleavage
Tenacity: Brittle
Streak: Brown red
Synonyms/varieties:
Comments: isostructural with aegirine
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