bournonite

{{Infobox mineral | name = Bournonite | category = Sulfosalt mineral | boxwidth = | boxbgcolor = | image = 2522M-bournonite1.jpg | imagesize = | caption = Bournonite from Viboras mine, Machacamarcha, Bolivia, 95 mm x 74 mm, largest crystal size: 29 mm | formula = PbCuSbS3 | IMAsymbol=Bnn | molweight = | strunz = 2.GA.50 | dana = 3.4.3.2 | system = Orthorhombic | class = Pyramidal (mm2) (same H-M symbol) | symmetry = Pn21m | color = Steel-gray to iron-black | colour = | habit = Crystals short prismatic to tabular, typically striated; commonly as subparallel aggregates. Also massive, granular to compact | twinning = On {110}, commonly forming cross or cogwheel aggregates | cleavage = [010] Imperfect | fracture = Subconchoidal to uneven | tenacity = | mohs = 2.5 – 3.0 | luster = Brilliant to dull | streak = Steel-gray to iron-black | diaphaneity = Opaque | gravity = 5.7 – 5.9 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = Very weak | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = }}

Bournonite, also axotomous antimony glance, wheel ore, berthonite, volchite or dystomic glance () is a sulfosalt mineral species, trithioantimoniate of lead and copper with the formula PbCuSbS3.