pyrargyrite

{{Infobox mineral | name = Pyrargyrite | category = Sulfosalt | boxwidth = | boxbgcolor = | image = Pyrargyrite-177493.jpg | imagesize = 260px | caption = | formula = Ag3SbS3 | IMAsymbol = Pyg | strunz = 2.GA.05 | system = Trigonal | class = Ditrigonal pyramidal (3m) (same H-M symbol) | symmetry = R3c | unit cell = a = 11.047 Å, c = 8.719 Å; Z = 6 | color = Deep red to red gray | habit = Include prismatic crystals with rhombohedral and scalenohedral faces forming terminations. massive, granular | twinning = Complex to lammellar | cleavage = Distinct on {101}, imperfect on {012} | fracture = Conchoidal, uneven | tenacity = Brittle | mohs = 2.5 | luster = Adamantine | refractive = nω = 3.084 nε = 2.881 | opticalprop = Uniaxial (–) | birefringence = δ = 0.203 | pleochroism = Distinct | streak = dark cherry red | gravity = 5.82 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent to nearly opaque | other = Darkens upon exposure to light; crystals are frequently striated | references = }}

Pyrargyrite is a sulfosalt mineral consisting of silver sulfantimonite, Ag3SbS3. Known also as dark red silver ore, ruby blende, garnete blende or ruby silver, it is an important source of the metal.