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Clinoferrosilite [abbr. Cfs ]

Year of discovery: 1935 (Obsidian cliff, Yellowstone National Park, USA), 1980 (Japan)

Locality list: A locality of clinoferrosilite

• FeSiO₃
• (Fe,Mg,Ca)SiO₃
• [Fe²⁺][SiO₃]^2-
• Ca/(Mg+Fe+Ca)=0-0.05, Fe/(Fe+Mg)=0.5-1.0

• Class: Ca-Mg-Fe pyroxene group < Pyroxene supergroup
• Class: Inosilicate (Single chain)
• Old definition was Fe/(Fe+Mg)=0.9-1.0

• Polymorph: Ferrosilite (Orthorhombic)

• Ca/(Mg+Fe+Ca) > 0.05: Pigeonite

• Fe => Mg: Clinoenstatite (Series), Enstatite, Akimotoite

• Color: Brown, Green, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Distinct on {110} (2 planes, 90 degree)
• Hardness: 5-6
• Density: 4.1

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=9.5, b=9.2, c=5.2, β=107.6