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Gismondine, Gismondine-Ca [abbr. Gis ]

Year of discovery: 1817 (Capo di Bove, Italy), 1952 (Japan)

Locality list: 12 localities of gismondine

• CaAl₂Si₂O₈,4H₂O
• [Ca²⁺][(AlSiO₄)₂]^2-,4H₂O

• Class: Gismondine group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)
• Ba-dominant phase, Gismondine-Ba, was recognized but it has not been approved.

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

• Cleavage: Imperfect on {101} (1 planes)
• Hardness: 4-5
• Density: 2.3

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=10.2, b=10.6, c=9.8, β=92.8