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Apophyllite-(KF) (Photo)

Year of discovery: 1976 (World), 1958 (Japan)

Locality list: 12 localities of apophyllite-(KF)

• KCa₄Si₈O₂₀F,8H₂O
• (K,Na)Ca₄Si₈O₂₀(F,OH),8H₂O
• [K⁺][Ca²⁺₄][F|(Si₂O₅)₄]^9-,8H₂O

• Class: Apophyllite group
• Class: Phyllosilicate - Fluoride - Hydrate
• Soluble in: HCl
• Fluorescence: UV excitation (Yellow)
• Radioactive: Very weak

• K => Na: Apophyllite-(NaF)

• F => OH: Apophyllite-(KOH) (Series)

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

• Habit: Bipyramidal

• Cleavage: Perfect on {001} (1 plane), Imperfect on {110} (2 planes)
• Hardness: 4.5-5
• 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: Fluorapophyllite