Formula: CaFeSi2O6
Origin of name: For M. Hedenberg, Swedish chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {100} or {010}, simple or polysynthetic
Unit cell: a = 9.85 Ǻ, b = 9.01 Ǻ, c = 5.26 Ǻ, β = 104.8°
Colour: Brownish green, grayish green, dark green, grayish black
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals short prismatic; massive, lamellar
Hardness: 6
Specific gravity: 3.50 to 3.56
Cleavage: 3; {110} good, {100} and {010} parting
Tenacity: Conchoidal to uneven; brittle
Streak: White, grayish
Synonyms/varieties:
Comments: Series with diopside and with johannsenite
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