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Gmelinite-Ca

Year of discovery: 1825 (Monte Nero, Italy), 1899 (Japan)

Locality list: 4 localities of gmelinite-Ca

• CaAl₂Si₄O₁₂,6H₂O
• (Ca,K₂,Na₂)Al₂Si₄O₁₂,6H₂O
• [Ca²⁺][(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-Ca (Triclinic), Lévyne-Ca (Levyne-Ca) (Trigonal)

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

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

• Cleavage: Good 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