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Saponite [abbr. Sap ]

Year of discovery: 1758 (Lizard Point, UK), 1936 (Japan)

Locality list: 104 localities of saponite

• Ca_0.25Mg₃Al_0.5Si_3.5O₁₀(OH)₂,nH₂O
• Ca_0.25(Mg,Fe)₃(Si,Al)₄O₁₀(OH)₂,nH₂O
• [Ca²⁺_0.25][Mg²⁺₃][(OH)₂|Al_0.5Si_3.5O₁₀]^6.5-,nH₂O

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

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

• Ca_0.25Mg₃ => Na_0.3Al₂; Beidellite (Series)

• Color: White, Grayish green, Yellowish green
• Streak: White
• Luster: Greasy
• Diaphaneity: Opaque

• Habit: Earthy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1.5-2
• Density: 2.3

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.3, b=9.1, c=16.9, β=97.0

Synonym: Aquakreptite