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Apophyllite-(KOH)

Year of discovery: 1978 (Ore Knob mine, USA), 1893 (Japan)

Locality list: 8 localities of apophyllite-(KOH)

• KCa₄Si₈O₂₀OH,8H₂O
• (K,Na)Ca₄Si₈O₂₀(OH,F),8H₂O
• [K⁺][Ca²⁺₄][OH|(Si₂O₅)₄]^9-,8H₂O

• Class: Apophyllite group
• Class: Phyllosilicate - Hydroxide - Hydrate
• Radioactive: Very weak

• OH => F: Apophyllite-(KF) (Series)

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

• Habit: Bipyramidal, Rectangular

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 4-5
• Density: 2.3

• System: Tetragonal
• Group: 4/mmm, P4/mnc
• Lattice: a=9.0, c=15.8

Name: Apo (leave) - phyllon (leaf) in Greek

Synonym: Hydroxylapophyllite