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Heulandite-K

• KCa₄Al₉Si₂₇O₇₂,24H₂O
• (Ca,K)_2-3(Al,Si)₁₈O₃₆,12H₂O
• [K⁺][Ca²⁺₄][(AlSi₃O₈)₉]^9-,24H₂O

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

• K => Na: Heulandite-Ca (Series)

• Ca₄Al₃ => K₅Si₃: Clinoptilolite-K (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