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Argentite

Cubic pseudomorph of Acanthite.

Year of discovery: before 1959 (World but not approved), 1875 (Japan)

Locality list: 317 localities of argentite

• Ag₂S
• [Ag⁺₂][S]^2-

• Class: Sulfide
• Soluble in: HNO₃
• Paramorph: Replaced by Acanthite.
• Stable only above 177 degree.

• Polymorph: Acanthite (below 177 degree, Monoclinic)

• Ag => Cu: Chalcocite

• Ag₂ => AgCu: Stromeyerite

• Ag_0.5 => Cu_0.5: Jalpaite

• Ag₈ => Ag₅Cu₃: Mckinstryite

• S => Se: Naumannite
• S => Te: Hessite

• S₂ => SeS: Aguilarite
• S₂ => TeS: Cervelleite

• Habit: Dodecahedral

• System: Cubic
• Group: m3m, Im3m
• Lattice: a=4.9

Etymology: Argent (silver) in Latin