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Gmelinite-K

• K₂Al₂Si₄O₁₂,6H₂O
• (K₂,Ca,Na₂)Al₂Si₄O₁₂,6H₂O
• [K⁺₂][(AlSi₂O₆)₂]^2-,6H₂O

• Class: Gmelinite series < Chabazite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Decompose)
• Radioactive: Very weak

• Polymorph: Chabazite-K (Trigonal)

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

• Color: Colorless, Pale brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Good on {1010} (3 planes), Parting on {0001} (1 plane)
• Hardness: 4.5
• Density: 2.0

• System: Hexagonal
• Group: 6/mmm, P6₃/mmc
• Lattice: a=13.6, c=10.3