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Mordenite (Photo), Ptilolite [abbr. Mor ]

Year of discovery: 1864 (Morden, Canada), 1929 (Japan)

Locality list: 270 localities of mordenite

• Na₂Al₂Si₁₀O₂₄,7H₂O
• (Na₂,Ca,K₂)Al₂Si₁₀O₂₄,7H₂O
• [Na⁺₂][(AlSi₅O₁₂)₂]^2-,7H₂O

• Class: Mordenite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Insoluble in: HCl
• Radioactive: Very weak

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular
• Aggregate: Radial

• Cleavage: Perfect on {100} (1 plane), Distinct on {010} (1 plane)
• Hardness: 3-4
• Density: 2.1

• System: Orthorhombic
• Group: mm2, Cmc2₁
• Lattice: a=18.2, b=20.5, c=7.5

Etymology: Morden district, Canada