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Nagyágite, Nagyagite

Year of discovery: 1845 (Sacarîmb (Nagyág), Romania), 1961 (Japan)

Locality list: A locality of nagyágite

• Pb(Pb,Sb)S₂,(Te,Au)
• [Pb²⁺][(Pb²⁺,Sb³⁺)][S₂]^4-,[(Te,Au)]⁰

• Class: Nagyágite (Nagyagite) group < Pseudohexagonal-Tetragonal layered Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: HNO₃, Aqua regia

• Sb => Bi: Buckhornite

• Color: Dark gray
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Thin Tabular
• Striation: [100] and [010] on (001)

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 1-1.5
• Density: 7.5

• System: Monoclinic, Pseudotetragonal, Pseudorhombic
• Group: 2/m, P2₁/m
• Lattice: a=4.2, b=4.2, c=15.1, β=95.4

Etymology: Nagyág (Nagyag) county in Romania