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Heulandite-Sr

Year of discovery: 1982 (Campegli mine (Sant'Elena mine), Italy), 2002 (Japan)

Locality list: A locality of heulandite-Sr

• NaSr₄Al₉Si₂₇O₇₂,24H₂O
• (Sr,Na,Ca)_2-3(Al,Si)₁₈O₃₆,12H₂O
• [Na⁺][Sr²⁺₄][(AlSi₃O₈)₉]^9-,24H₂O

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

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

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

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3-3.5
• Density: 2.2

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=7.5, b=16.8, c=15.9, β=91.4

Etymology: H. Heuland, British mineral collector