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Edingtonite

Year of discovery: 1825 (Kilpatrick Hills, UK), 1991 (Japan)

Locality list: A locality of edingtonite

• BaAl₂Si₃O₁₀,4H₂O
• [Ba²⁺][Al₂Si₃O₁₀]^2-,4H₂O

• Class: Natrolite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)

• Ba => Ca: Scolecite, Cowlesite
• Ba => Na₂: Natrolite, Gonnardite, Paranatrolite

• Ba₃ => Na₂Ca₂: Mesolite

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

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 4-5
• Density: 2.7

• System: Orthorhombic, Tetragonal (Order-Disorder polytype)
• Group: 222, P2₁2₁2₁, 42, P42₁m
• Lattice: a=9.6, b=9.7, c=6.5