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Sternbergite

Year of discovery: 1828 (Jáchymov, Czech), 1956 (Japan)

Locality list: 9 localities of sternbergite

• AgFe₂S₃
• [Ag⁺][Fe²⁺₂][S₃]

• Class: Sulfide

• Polymorph: Argentopyrite (Orthorhombic)

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

• Color: Yellowish brown
• Tarnish: Bluish purple
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Thin pseudohexagonal plate
• Aggregate: Rosette, Fan-like
• Striation: [100] and [010] on {001}
• Twin: {130}

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1-1.5
• Density: 4.2

• System: Orthorhombic, Pseudohexagonal
• Group: mmm, Cmma
• Lattice: a=6.6, b=11.6, c=12.7

Etymology: Count Casper Maria Sternberg (1761-1838) in Prague