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Heulandite-Ca (Photo)

Year of discovery: 1822 (Strathclyde, UK), 1963 (Japan)

Locality list: 8 localities of heulandite-Ca

• NaCa₄Al₉Si₂₇O₇₂,24H₂O
• (Ca,Na)_2-3(Al,Si)₁₈O₃₆,12H₂O
• [Na⁺][Ca²⁺₄][(AlSi₃O₈)₉]^9-,24H₂O

• Class: Heulandite series < Heulandite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl
• Radioactive: Very weak

• Na => K: Heulandite-K (Series)

• Ca => Na₂: Heulandite-Na (Series)
• Ca => Sr: Heulandite-Sr (Series)
• Ca => Ba: Heulandite-Ba (Series)

• NaCaAl₃ => Si₃: Clinoptilolite-Ca (Series)

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

• Habit: Hexagonal tabular

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

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=7.4, b=16.8, c=15.9, β=91.4

Etymology: H. Heuland, British mineral collector