[ Top ] [ Japanese ]

Offretite

Year of discovery: 1890 (Mont Semiol, France), 2010 (Japan)

Locality list: A locality of offretite

• KCaMgAl₅Si₁₃O₃₆,16H₂O
• (K,Ca,Mg)₃Al₅Si₁₃O₃₆,16H₂O
• [K⁺][Ca²⁺][Mg²⁺][Al₅Si₁₃O₃₆]^5-,16H₂O

• Class: Chabazite subgroup < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Radioactive: Very weak

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

• Cleavage: Distinct on {0001} (1 plane)
• Hardness: 4-4.5
• Density: 2.1

• System: Hexagonal
• Group: (-6)m2, P(-6)m2
• Lattice: a=13.3, c=7.6