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Miargyrite

Year of discovery: 1829 (Neue Hoffnung Gottes mine, Germany), 1951 (Japan)

Locality list: 33 localities of miargyrite

• AgSbS₂
• [Ag⁺][Sb³⁺][S₂]^4-

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

• Polymorph: Cuboargyrite (Cubic), Baumstarkite (Triclinic)

• Sb => Bi: Matildite, Schapbachite
• Sb => (Sb,Bi): Aramayoite
• Sb => As: Smithite, Trechmannite

• Color: Dark reddish black
• Streak: Dark red
• Luster: Metallic
• Diaphaneity: Translucent

• Habit: Tabular on {001}, {100}, or {-101}
• Striation: [010] and [0-11]

• Cleavage: Imperfect on {010} (1 plane), Poor on {100} and {101} (2 planes)
• Hardness: 2.5
• Density: 5.3

• System: Monoclinic
• Group: m, Bb
• Lattice: a=13.2, b=4.4, c=12.9, β=98.6

Etymology: Mi (less) and Argent (silver) in Greek