Basic Information

Name: Iridium 
Symbol: Ir 
Atomic Number: 77 
Atomic Mass: 192.217 amu 
Melting Point: 2410.0 °C (2683.15 K, 4370.0 °F) 
Boiling Point: 4527.0 °C (4800.15 K, 8180.6 °F) 
Number of Protons/Electrons: 77 
Number of Neutrons: 115 
Classification: Transition Metal 
Crystal Structure: Cubic 
Density @ 293 K: 22.5 g/cm3 
Color: white
Date of Discovery: 1804 
Discoverer: S. Tenant 
Name Origin: From the Latin word iridis (rainbow) 
Uses: tip gold pens, crucible and special containers 
Obtained From: gravel deposits with platinum