dyscrasite

{{Infobox mineral | name = Dyscrasite | category = Antimonide minerals | boxwidth = | boxbgcolor = | image = Dyscrasite-22000.jpg | imagesize = 260px | caption = Twinned dyscrasite crystals from the Czech Republic (size: 4.5 × 4.5 × 3.3 cm) | formula = Ag3+xSb1−x (x ≈ 0.2) | IMAsymbol = Dys | molweight = | strunz = 2.AA.35 | system = Orthorhombic | class = Pyramidal (mm2) H-M symbol: (mm2) | symmetry = Pmm2 | unit cell = a = 3.008, b = 4.828 c = 5.214 [Å]; Z = 1 | color = Silver-white (tarnishes to lead-gray, yellowish, or black) | habit = Pyramidal crystals also cylindrical, prismatic to platy, striated; granular, foliated or massive | twinning = On {110} produces pseudohexagonal forms | cleavage = Distinct on {001} {001}, imperfect on {110} | fracture = Irregular or uneven | tenacity = Sectile | mohs = – 4 | luster = Metallic | refractive = | opticalprop = | birefringence = Very weak | pleochroism = Very weak | streak = Silver-white | gravity = 9.4 – 10 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = Weakly anisotropic | references = }}

The silver antimonide mineral dyscrasite has the chemical formula Ag3Sb. It is an opaque, silver white, metallic mineral which crystallizes in the orthorhombic crystal system. It forms pyramidal crystals up to and can also form cylindrical and prismatic crystals.