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Empressite

Year of discovery: 1914 (Empress Josephine mine, USA), 1955 (Japan)

Locality list: 2 localities of empressite

• AgTe
• [Ag⁺][Te]

• Class: Telluride
• Soluble in: HNO₃

• Ag => Cu: Vulcanite
• Ag => Hg: Coloradoite
• Ag => Bi: Tsumoite
• Ag => Pb: Altaite

• Color: Reddish brown
• Tarnish: Dark reddish brown
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Granular

• Cleavage: No
• Hardness: 3-3.5
• Density: 7.6

• System: Orthorhombic
• Group: mmm, Pmnm
• Lattice: a=8.9, b=20.1, c=4.6

Etymology: Empress Josephine mine, Colorad, USA