Physical Properties of Cobalt and Iron
Melting Point
1,495.00 °C
  
29
1,535.00 °C
  
25
Boiling Point
2,870.00 °C
  
34
2,750.00 °C
  
37
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Gray
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Vickers Hardness
1,043.00 MPa
  
11
Speed of Sound
4,720.00 m/s
  
14
5,120.00 m/s
  
8
Optical Properties
  
  
Allotropes
Yes
  
Yes
  
α Allotropes
α-Cobalt
  
Ferrite (alpha Iron)
  
β Allotropes
β-Cobalt
  
beta Iron
  
γ Allotropes
Not Available
  
gamma Iron