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Heulandite-Ba

Year of discovery: 2003 (Northern Ravnås prospecte, Norway), 2002 (Japan)

Locality list: 2 localities of heulandite-Ba

• NaBa₄Al₉Si₂₇O₇₂,24H₂O
• (Ba,Na,Ca)_2-3(Al,Si)₁₈O₃₆,12H₂O
• [Na⁺][Ba²⁺₄][(AlSi₃O₈)₉]^9-,24H₂O

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

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

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

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3.5
• Density: 2.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=17.7, b=17.9, c=7.4, β=116.6

Etymology: H. Heuland, British mineral collector