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Sudoite [abbr. Sud ]

Year of discovery: 1954 (Japan as the first occurence in the World)

Locality list: 23 localities of sudoite

• Mg₂Al₄Si₃O₁₀(OH)₈
• (Mg,Fe)₂(Al,Fe)₃AlSi₃O₁₀(OH)₈
• [Mg²⁺₂][Al³⁺₃][(OH)₈|AlSi₃O₁₀]^13-

• Class: Chlorite group
• Class: Phyllo-Aluminosilicate - Hydroxide

• Mg₂ => Al_1.33: Donbassite

• Al₂ => Mg₃: Clinochlore

• Color: White, Pale green
• Streak: White
• Luster: Pearly
• Diaphaneity: Translucent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 2.5-3.5
• Density: 2.7

• System: Monoclinic, Triclinic (1A) (Layer-stacking polytype)
• Group: 2/m, C2/m
• Lattice: a=5.2, b=9.1, c=14.3, β=97.0

Etymology: Professor Toshio Sudo, Japanese mineralogist of Tokyo University of Education.