Physical Properties of Cobalt and Molybdenum
Melting Point
1,495.00 °C
  
29
Boiling Point
2,870.00 °C
  
34
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Gray
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Brinell Hardness
1,370.00 MPa
  
7
Vickers Hardness
1,043.00 MPa
  
11
1,400.00 MPa
  
6
Speed of Sound
4,720.00 m/s
  
14
5,400.00 m/s
  
6
Optical Properties
  
  
Allotropes
Yes
  
No
  
α Allotropes
α-Cobalt
  
Not Available
  
β Allotropes
β-Cobalt
  
Not Available
  
γ Allotropes
Not Available
  
Not Available