tyrrellite

{{Infobox mineral | name = Tyrrellite | category = Selenide mineral Thiospinel group (Spinel structural group) | boxwidth = | image =Tyrrellite, Chalcomenite, Umangite-652476.jpg | caption = | formula = | IMAsymbol = Ty | molweight = | strunz = 2.DA.05 | system = Isometric | class = Hexoctahedral (mm) H-M symbol: (4/m 2/m) | symmetry = Fdm | unit cell = a= 10.005 Å; Z = 8 | color = light bronze | habit = granular | twinning = | cleavage = {001} Distinct | fracture = conchoidal | tenacity = brittle | mohs = 3.5 | luster = metallic | refractive = | opticalprop = | birefringence = | pleochroism = | streak = black | gravity = 6.6 ± 0.2 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = | references = }}

Tyrrellite is a selenide mineral that has a chemical formula of . It has been found in the Goldfields District in northern Saskatchewan, as well as in the Petrovice deposit, Czech Republic. It is named after the Canadian geologist Joseph Burr Tyrrell. Joseph Tyrrell was one of the first geologists from the Geological Survey of Canada to do research in the Goldfields District.