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Erionite-Ca

Year of discovery: 1966 (Japan as the first occurence in the World)

Locality list: 3 localities of erionite-Ca

• Ca₂Al₄Si₁₄O₃₆,15H₂O
• (Ca,K₂,Na₂)₂Al₄Si₁₄O₃₆,15H₂O
• [Ca²⁺₂][Al₄Si₁₄O₃₆]^4-,15H₂O

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

• Ca => K₂: Erionite-K
• Ca => Na₂: Erionite-Na

• 7.5H₂O => 7H₂O: Stellerite

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

• Habit: Acicular, Stringy

• Cleavage: Distinct on {010} (1 plane)
• Hardness: 3.5-4
• Density: 2.0

• System: Hexagonal
• Group: 6/mmm, P6₃/mmc
• Lattice: a=13.2, c=15.1