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Sauconite

Year of discovery: 1875 (Friedensville mine, USA, and Ueberroth mine, USA), 1982 (Japan)

Locality list: 6 localities of sauconite

• Na_0.3Zn₃Al_0.3Si_3.7O₁₀(OH)₂,4H₂O
• Na_0.3Zn₃(Si,Al)₄O₁₀(OH)₂,4H₂O
• [Na⁺_0.3][Zn²⁺₃][(OH)₂|Al_0.3Si_3.7O₁₀]^6.3-,4H₂O

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

• NaAl => Si: Zincsilite (Series)

• Zn => Mg: Hectorite

• Zn₃ => Al₂: Beidellite

• Color: Reddish brown
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent

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

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.3, b=9.3, c=15.8, β=95.0