Formula: (Fe,Mn,Ca)SiO3
Origin of name: from pyroxene and ferrous iron
Crystal system: triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 6.632, b = 7.563, c = 17.38, α = 114.31°, β = 82.75°, γ = 94.58°
Colour: brown to yellow, colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: embedded grains
Hardness: 4.5-5.5
Specific gravity: 3.68 to 3.76
Cleavage: [110] perfect, [010] poor, [001] poor
Tenacity:
Streak: White
Synonyms/varieties:
Comments: series with pyroxmangite
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