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Dachiardite-Na

Year of discovery: 1977 (La Palaccia-Orli di Fassa, Italy), 1975 (Japan)

Locality list: 3 localities of dachiardite-Na

• Na₄Al₄Si₂₀O₄₈,13H₂O
• (Na₂,Ca,K₂)₂Al₄Si₂₀O₄₈,13H₂O
• [Na⁺₄][(AlSi₅O₁₂)₄],13H₂O

• Class: Dachiardite series < Mordenite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Radioactive: Very weak

• Na₄ => Ca₂: Dachiardite-Ca
• Na₂ => K₂: Dachiardite-K

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

• Cleavage: Perfect on {100} and {001} (2 planes)
• Hardness: 4-4.5
• Density: 2.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=18.6, b=7.5, c=10.3, β=108.4