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Rectorite

Year of discovery: 1891 (Blue Mountain district, USA), 1960 (Japan)

Locality list: 20 localities of rectorite

• (Na,Ca)Al₄(Si,Al)₈O₂₀(OH)₄,2H₂O
• [Na⁺][Al³⁺₄][(OH)₄|(Si,Al)₂O₅)₄]^13-,2H₂O
• 1:1 regular interstratified mineral of dioctahedral True mica ( Muscovite or Illite ) with dioctahedral Montmorillonite

• Class: Dioctahedral 1:1 regular interstratified mineral < Planar hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllo-Aluminosilicate - Hydroxide - Hydrate
• Radioactive: Very weak

• Color: Pale brown
• Streak: White
• Luster: Earthy

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

• System: Monoclinic
• Lattice: a=5.1, b=8.9, c=23.9, β=96.3