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Heulandite-Na

Year of discovery: 1998 (Challis, USA), 1937 (Japan)

Locality list: A locality of heulandite-Na

• (Na,Ca)₆(Si,Al)₃₆O₇₂,24H₂O
• (Na,Ca)_2-3(Al,Si)₁₈O₃₆,12H₂O
• [(Na⁺,Ca²⁺)₆][(Si,Al)₃₆O₇₂],24H₂O

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

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

• Ca_xAl₃ => NaSi₃: Clinoptilolite-Na (Series)

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

• Habit: Hexagonal tabular

• 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=17.8, c=15.9, β=91.4

Etymology: H. Heuland, British mineral collector