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Argentopyrite

Year of discovery: 1868 (Jáchymov, Czech), 1969 (Japan)

Locality list: 3 localities of argentopyrite

• AgFe₂S₃
• [Ag⁺][Fe³⁺₂][S₃]

• Class: Cubanite group
• Class: Sulfide

• Polymorph: Sternbergite (Orthorhombic)

• Ag => Tl: Picotpaulite
• Ag => Cu: Cubanite (Orthorhombic), Isocubanite (Cubic)

• Color: Brown
• Tarnish: Light gray
• Streak: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudohexagonal short prism elongated to {001}, {011} pyramidal faces
• Twin: [001] along {120} Intrusion

• Cleavage: No
• Hardness: 3.5-4
• Density: 4.3

• System: Orthorhombic, Pseudohexagonal
• Group: mmm, Pmmm
• Lattice: a=6.6, b=11.5, c=6.5

Name: Pyrite containing argent (silver in Latin)