Physical Properties of Cobalt and Radium
Melting Point
1,495.00 °C
  
29
Boiling Point
2,870.00 °C
  
34
1,737.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Silvery White
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
1,043.00 MPa
  
11
Not Available
  
Speed of Sound
4,720.00 m/s
  
14
Not Available
  
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
Yes
  
No
  
α Allotropes
α-Cobalt
  
Not Available
  
β Allotropes
β-Cobalt
  
Not Available
  
γ Allotropes
Not Available
  
Not Available