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Naumannite

Year of discovery: 1845 (Tilkerode (Abberode), Germany), 1916 (Japan)

Locality list: 13 localities of naumannite

• Ag₂Se
• [Ag⁺₂][Se]^2-

• Class: Acanthite group
• Class: Selenide

• Se => S: Acanthite, Argentite

• Se₂ => SeS: Aguilarite

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

• Habit: Pseudocubic, Platey

• Cleavage: No
• Hardness: 2.5
• Density: 7.0

• System: Orthorhombic, Pseudocubic
• Group: 222, P2₁2₁2₁
• Lattice: a=4.3, b=7.1, c=7.8

Etymology: Carl Friedrich Naumann (1797-1873), German mineralogist