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Corrensite [abbr. Crr ]

Year of discovery: 1954 (Zaisersweiher, Germany), 1959 (Japan)

Locality list: 7 localities of corrensite

• Mg₉Si₈O₂₀(OH)₁₀,nH₂O
• (Mg,Fe)₉(Si,Al)₈O₂₀(OH)₁₀,nH₂O
• [Mg²⁺₉][(OH)₁₀|(Si₂O₅)₄]^18-,nH₂O
• 1:1 regular interstratified mineral of trioctahedral Chlorite with trioctahedral Vermiculite or Smectite

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

• Color: Dark green
• Streak: Pale gray
• Luster: Earthy
• Diaphaneity: Translucent

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

• System: Orthorhombic
• Lattice: a=5.3, b=9.2, c=29.0