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Armenite

Year of discovery: 1940 (Armen mine, Norwaya), 2021 (Japan)

Locality list: A locality of armenite

• BaCa₂Al₆Si₉O₃₀,2H₂O
• [Ba²⁺][]₂[Ca²⁺₂][Al³⁺₃][Al₃Si₉O₃₀]^15-,2H₂O

• Class: Cyclo-Aluminosilicate (Double ring) - Hydrate

• Color: Colorless, Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Perfect on {010} (A plane), Distinct on {110} (2 planes)
• Hardness: 7.5
• Density: 2.8

• System: Orthorhombic
• Group: mmm, Pnna
• Lattice: a=13.9, b=18.7, c=10.7