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Clinoptilolite-K

Year of discovery: 1923 (Hoodoo mountain, USA), 1964 (Japan)

Locality list: A locality of clinoptilolite-K

• K₆Al₆Si₃₀O₇₂,20H₂O
• (K₂,Na₂,Ca)₃Al₆(Al,Si)₄Si₂₆O₇₂,20H₂O
• [K⁺₆][(AlSi₅O₁₂)₆]^3-,20H₂O

• Class: Clinoptilolite series < Heulandite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Fluorescence: UV excitation (Pale green)
• Radioactive: Very weak

• K => Ca_0.5: Clinoptilolite-Ca (Series)
• K => Na: Clinoptilolite-Na (Series)

• K₅Si₃ => Ca₄Al₃: Heulandite-K (Series)

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

• Habit: Earthy

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

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=17.7, b=18.0, c=7.4, β=116.5