laurite

{{Infobox mineral | name = Laurite | image = Laurite.jpg | alt = | caption = |struct image = Kristallstruktur Pyrit.png |struct caption = Crystal structure of Laurite S Ru | category = Sulfide mineral | formula = RuS2 | strunz = 2.EB.05a | dana = | system = Cubic | class = Diploidal (m) H-M symbol: (P 2/m ) | symmetry = Pa | unit cell = a = 5.61 Å; Z = 4 | color = Iron-black; white to gray or bluish in polished section | habit = As octahedral, cubic, and pyritohedral crystals or as rounded grains and inclusions | twinning = | cleavage = Perfect on {111} | fracture = Subconchoidal | tenacity = Brittle | mohs = 7.5 | luster = Metallic | streak = Dark gray | diaphaneity = Opaque | gravity = 6.43 | density = 6.43 g/cm3 (Measured) 6.39 g/cm3 (Calculated) | polish = | opticalprop = Isotropic and opaque | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

Laurite is an opaque black, metallic ruthenium sulfide mineral with formula: RuS2. It crystallizes in the isometric system. It is in the pyrite structural group. Though it's been found in many localities worldwide, it is extremely rare.