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Stilbite-Ca (Photo)

Year of discovery: 1797 (World), 1944 (Japan)

Locality list: 22 localities of stilbite-Ca

• NaCa₄Al₉Si₂₇O₇₂,nH₂O
• [Na⁺][Ca²⁺₄][(AlSi₃O₈)₉]^9-,nH₂O

• Class: Stilbite series < Heulandite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Decompose)

• Ca => Na₂: Stilbite-Na

• NaAl => Si: Stellerite

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

• Habit: Truncated long platy
• Aggregate: Radial

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3.5-4
• Density: 2.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=13.6, b=18.2, c=11.3, β=129.2

Etymology: Stilbein (Weakly shine) in Greek