ullmannite

{{Infobox mineral | name = Ullmannite | category = Sulfide mineral | boxwidth = | boxbgcolor = | image = Ullmannite - Mt Narba - Sardinia.JPG | imagesize = 260px | caption = | formula = NiSbS | IMAsymbol = Ull | strunz = 2.EB.25 | system = Cubic | class = Tetartoidal (23) H-M symbol: (23) | symmetry = P213 | unit cell = a = 5.91(2) Å; Z = 4 | molweight = | color = Steel-gray to tin white | habit = | twinning = Penetration twins about [110] | cleavage = Perfect on {001} | fracture = Uneven | tenacity = Brittle | mohs = 5–5.5 | luster = metallic | streak = | diaphaneity = Opaque | gravity = 6.65–6.85 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = }}

Ullmannite or Nickel glance (trivial name) is a nickel antimony sulfide mineral with formula: NiSbS. Considerable substitution occurs with cobalt and iron in the nickel site along with bismuth and arsenic in the antimony site. A solid solution series exists with the high cobalt willyamite.