Tyrrellite
Tyrrellite is a selenide mineral that has a chemical formula of Cu(Co,Ni)2Se4.[4] It has been found in the Goldfields District in northern Saskatchewan, as well as in the Petrovice deposit, Czech Republic.[3] 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.[6]