Physical Properties of Cobalt and Technetium
Melting Point
1,495.00 °C
  
29
Boiling Point
2,870.00 °C
  
34
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Shiny Gray
  
Luster
Metallic
  
NA
  
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
16,200.00 m/s
  
1
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