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Barrerite

Year of discovery: 1974 (Sant'Efisio Tower, Italy), 2005 (Japan)

Locality list: A locality of barrerite

• Na₂Al₂Si₇O₁₈,7H₂O
• (Na,K,Ca)₂Al₂Si₇O₁₈,7H₂O
• [Na⁺₂][Al₂Si₇O₁₈]^2-,7H₂O

• Class: Heulandite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Radioactive: Very weak

• Na₂ => Ca: Stellerite

• 7H₂O => 7.5H₂O: Erionite-Na

• Color: White-Pink
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Transparent

• Cleavage: Perfect
• Hardness: 3-4
• Density: 2.3

• System: Orthorhombic
• Group: mmm, Amma
• Lattice: a=13.6, b=18.2, c=17.8