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Gonnardite

Year of discovery: 1896 (La Chaux de Bergonne, France), 1967 (Japan)

Locality list: 14 localities of gonnardite

• Na₂Al₂Si₃O₁₀,3H₂O
• (Na,Ca)₂(Si,Al)₅O₁₀,3H₂O
• [Na⁺₂][Al₂Si₃O₁₀]^2-,3H₂O

• Class: Natrolite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water

• Polymorph: Paranatrolite (Monoclinic)

• Na₂ => Ca: Scolecite, Cowlesite
• Na₂ => Ba: Edingtonite

• Na₆ => Na₂Ca₂: Mesolite

• 3H₂O => 2H₂O: Natrolite

• Color: White
• Streak: White
• Luster: Metallic
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect
• Hardness: 4-5
• Density: 2.3

• System: Orthorhombic
• Group: (-4)2m, I(-4)2d
• Lattice: a=13.4, b=13.4, c=6.7

Synonym: Tetranatrolite