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Palygorskite [abbr. Plg ]

Year of discovery: 1862 (Popovka river, Russia), 1957 (Japan)

Locality list: 23 localities of palygorskite

• Mg₅Si₈O₂₀(OH)₂,8H₂O
• (Mg,Al)₅(Si,Al)₈O₂₀(OH)₂,8H₂O
• [Mg²⁺₅][(OH)₂|(Si₂O₅)₄]^10-,8H₂O

• Class: 2:1 layer, Strip-Octahedral < Modulated hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate - Hydroxide - Hydrate
• Physical: Elastic

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

• Color: White, Gray, Pale brown
• Streak: White
• Luster: Waxy, Earthy
• Diaphaneity: Translucent

• Habit: Acicular

• Cleavage: Good on {110} (2 planes)
• Hardness: 2-2.5
• Density: 2.6

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=12.8, b=17.9, c=5.2, β=95.8

Synonym: Attapulgite