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Matildite

Year of discovery: 1883 (Matilda mine, Peru), 1898 (Japan)

Locality list: 19 localities of matildite

• AgBiS₂
• [Ag⁺][Bi³⁺][S₂]^4-

• Class: Matildite group < Binary sulfosalts < Sulfosalt class
• Class: Sulfosalt
• Soluble in: HNO₃

• Polymorph: Schapbachite (Cubic)

• Bi => Sb: Miargyrite, Cuboargyrite, Baumstarkite
• Bi => (Sb,Bi): Aramayoite
• Bi => As: Smithite, Trechmannite

• S => Se: Bohdanowiczite
• S => Te: Volynskite

• Color: Black, Gray
• Streak: Light gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Prismatic

• Cleavage: No
• Hardness: 2.5
• Density: 6.9

• System: Hexagonal
• Group: (-3)m, P(-3)m1
• Lattice: a=8.1, c=19.0

Etymology: Matilda mine in Peru