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Sepiolite (Photo) [abbr. Sep ]

Year of discovery: 1847 (Bettolino, Italy), 1954 (Japan)

Locality list: 48 localities of sepiolite

• Mg₄Si₆O₁₅(OH)₂,6H₂O
• [Mg²⁺₄][(OH)₂|(Si₂O₅)₃]^8-,6H₂O

• Class: 2:1 layer, Strip-Octahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide - Hydrate
• Soluble in: HCl (Decompose)

• Mg => Ni: Falcondoite

• [] => MgSi₂O₅,2H₂O: Palygorskite (Series)

• Color: White, Gray, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Habit: Earthy

• Cleavage: Good (1 plane)
• Hardness: 2
• Density: 2.0

• System: Orthorhombic
• Group: mmm, Pnan
• Lattice: a=5.2, b=26.7, c=13.5