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Hedenbergite (Photo) [abbr. Hd ]

Year of discovery: 1819 (Mormorsgruvan, Sweden), 1892 (Japan)

Locality list: 411 localities of hedenbergite

• CaFeSi₂O₆
• [Ca²⁺][Fe²⁺][(SiO₃)₂]^4-
• Ca/(Mg+Fe+Ca)=0.45-0.5

• Class: Ca-Mg-Fe pyroxene group < Pyroxene supergroup
• Class: Inosilicate (Single chain)
• Variety: Ferrosalite (+Mg)
• Insoluble in: HCl

• Ca/(Mg+Fe+Ca) < 0.45: Augite
• Ca/(Mg+Fe+Ca) > 0.5: Wollastonite

• Fe => Mg: Diopside (Series)
• Fe => Mn: Johannsenite (Series)
• Fe => Zn: Petedunnite (Series)

• Color: Grayish green, Dark green
• Streak: Pale green, Gray
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Habit: Acicular, Prismatic
• Aggregate: Radial

• Cleavage: Good on {110} (2 planes, 90 degree), Parting on {100} and {010} (2 planes)
• Hardness: 5.5-6.5
• Density: 3.6

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=9.9, b=9.0, c=5.3, β=104.8

Synonym: Funkite, Hudsonite, Lotalite