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Dachiardite-Ca (Photo)

Year of discovery: 1906 (La Speranza, Italy), 1963 (Japan)

Locality list: 6 localities of dachiardite-Ca

• Ca₂Al₄Si₂₀O₄₈,13H₂O
• (Ca,Na₂,K₂)₂Al₄Si₂₀O₄₈,13H₂O
• [Ca²⁺₂][(AlSi₅O₁₂)₄],13H₂O

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

• Ca => Na₂: Dachiardite-Na
• Ca₂ => K₂Ca: Dachiardite-K

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparet-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=107.8