Formula: (Mg,Fe,Ca)(Mg,Fe)Si2O6
Origin of name: after locality Pigeon Point, Minnesota, USA
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.706, b = 8.95, c = 5.246, β = 108.59°
Colour: Brown, light purplish brown, greenish brown, black
Diaphaneity: Translucent to nearly opaque
Luster: Vitreous to dull
Habit: Crystals short prismatic, small grains
Hardness: 6
Specific gravity: 3.30 to 3.46
Cleavage: 4; {110} good, {001}, {010} and {100} parting
Tenacity: Brittle, conchoidal fracture
Streak: Gray white
Synonyms/varieties:
Comments: also found in meteorites
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