Date of Discovery: 1804
Discoverer: Smithson Tenant
Name Origin: From the Latin word iridis (rainbow)
Uses: tip gold pens, crucible and special containers
Obtained From: gravel deposits with platinum

 
Atomic Number: 77
Atomic Mass: 192.217amu
Melting Point: 2410.0 °C (2683.15 K, 4370.0 °F)
Boiling Point: 4527.0 °C (4800.15 K, 8180.6 °F)
Crystal Structure: Cubic
Density @ 293 K: 22.5 g/cm3
Color: white

 
Isotope Ir-188 Ir-189 Ir-190 Ir-190m Ir-19m2 Ir-191 Ir-192 Ir-193 Ir-193m Ir-194 Ir-194m
Half Life 1.7 days 13.2 days 11.8 days 1.2 hours 3.2 hours Stable 73.8 days Stable 10.5 days 19.3 hours 170.0 days