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Tosudite

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

Locality list: 29 localities of tosudite

• Na_0.5Al,Mg)₆(Si,Al)₈O₁₈(OH)₁₂,5H₂O
• [Na⁺_0.5][(Al³⁺,Mg²⁺)₆[(OH)₁₂|(Si,Al)₈O₁₈],5H₂O
• 1:1 regular interstratified mineral of dioctahedral Chlorite ( Clinochlore ) with dioctahedral Smectite (Montmorillonite)

• Class: Dioctahedral 1:1 regular interstratified mineral < Planar hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide - Hydrate

• Color: White, Pale yellow
• Streak: White
• Luster: Waxy
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1-2
• Density: 2.8

• System: Monoclinic
• Group: 2, C2
• Lattice: a=5.2, b=9.0, c=24.2, β=94.0

Etymology: Professor Toshio Sudo (1911-2000), clay mineralogist of the University of Tokyo.