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Erionite-K

• K₄Al₄Si₁₄O₃₆,15H₂O
• (K₂,Ca,Na₂)₂Al₄Si₁₄O₃₆,15H₂O
• [K⁺₄][Al₄Si₁₄O₃₆]^4-,15H₂O

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

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

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

• Habit: Acicular, Stringy

• Cleavage: Distinct on {010} (1 plane)
• Hardness: 3.5-4
• Density: 2.1

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