Iridium

In nature, iridium is found in the Earth's crust, 0.001 ppm, in alloys with osmium, platinum and gold [4]. The isotopes found in nature are ¹⁹¹Ir (38.5 %, stable) and ¹⁹³Ir (61.5 %, stable) [4].

In pure solid form, cobalt exist in face-centered cubic form [4]