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Apophyllite-(NaF)

Year of discovery: 1975 (Japan as the first occurence in the World)

Locality list: 2 localities of apophyllite-(NaF)

• NaCa₄Si₈O₂₀F,8H₂O
• (Na,K)Ca₄Si₈O₂₀(F,OH),8H₂O
• [Na⁺][Ca²⁺₄][F|(Si₂O₅)₄]^9-,8H₂O

• Class: Apophyllite group
• Class: Phyllosilicate - Fluoride - Hydrate

• Na => K: Apophyllite-(KF)

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

• Habit: Bipyramidal, Rectanglar

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

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=8.9, b=8.9, c=15.8

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

Synonym: Natroapophyllite