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Stromeyerite

Year of discovery: 1832 (Zmeinogorsk mine (Snake Mountain mine, Schlangenberg mine), Russia), 1947 (Japan)

Locality list: 23 localities of stromeyerite

• AgCuS
• [Ag⁺][Cu⁺][S]^2-

• Class: Stromeyerite group
• Class: Sulfide
• Soluble in: HNO₃

• Ag => Cu: Chalcocite

• Cu => Ag: Argentite, Acanthite

• Cu_0.5 => Ag_0.5: Jalpaite

• Cu_0.25 => Ag_0.25: Mckinstryite

• S => Se: Eucairite

• Color: Dark gray
• Tarnish: Dark blue, Bluish gray
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudohexagonal prismatic elongated to [010]
• Twin: {101}

• Cleavage: No
• Hardness: 2.5-3
• Density: 6.2

• System: Orthorhombic
• Group: mmm, Cmcm
• Lattice: a=4.1, b=6.6, c=7.9

Etymology: Friedrich Stromeyer (1776-1835), German chemist who analyzed this mineral for the first time.