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Garronite

Year of discovery: 1962 (Glenariff valley, UK), 1969 (Japan)

Locality list: 9 localities of garronite

• Na₂Ca₅Al₁₂Si₂₀O₆₄,27H₂O
• [Na⁺₂][Ca²⁺₅][(Al₃Si₅O₁₆)₄]^12-,27H₂O

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

• Ca => Na: Garronite-(Na)

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

• Cleavage: Good
• Hardness: 4-5
• Density: 2.2

• System: Tetragonal
• Group: 4/m, P4₁/a
• Lattice: a=9.9, c=10.2