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Gmelinite-Na

Year of discovery: 1825 (Monte Nero, Italy), 1977 (Japan)

Locality list: 2 localities of gmelinite-Na

• Na₂Al₂Si₄O₁₂,6H₂O
• (Na₂,Ca,K₂)Al₂Si₄O₁₂,6H₂O
• [Na⁺₂][(AlSi₂O₆)₂]^2-,6H₂O

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

• Polymorph: Chabazite-Na (Trigonal), Lévyne-Na (Levyne-Na) (Trigonal)

• Na₂ => Ca: Gmelinite-Ca
• Na => K: Gmelinite-K

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

• Cleavage: Distinct on {1010} (3 planes), Parting on {0001} (1 plane)
• Hardness: 4.5
• Density: 2.1

• System: Hexagonal
• Group: 6/mmm, P6₃/mmc
• Lattice: a=13.8, c=10.0