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Ferrosaponite

Year of discovery: 2002 (Levoberezhnoe deposit, Russia), 1940 (Japan)

Locality list: 38 localities of ferro-saponite

• Ca_0.25Fe₃Al_0.5Si_3.5O₁₀(OH)₂,4H₂O
• Ca_0.25(Fe²⁺,Mg,Fe³⁺)₃(Al,Si)₄O₁₀(OH)₂,4H₂O
• [Ca²⁺_0.25][Fe²⁺₃][(OH)₂|Al_0.5Si_3.5O₁₀]^6.5-,4H₂O

• Class: Trioctahedral < Smectite group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide
• Radioactive: Very weak

• Fe => Mg: Saponite
• Fe => Cu: Yakhontovite

• Color: Dark green, Greenish brown
• Streak: Green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Earthy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2
• Density: 2.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.4, b=9.3, c=14.6, β=95.0