Physical Properties of Holmium and Cobalt
Melting Point
1,461.00 °C
  
30
1,495.00 °C
  
29
Boiling Point
2,600.00 °C
  
99+
2,870.00 °C
  
34
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Gray
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Vickers Hardness
1,043.00 MPa
  
11
Speed of Sound
2,760.00 m/s
  
30
4,720.00 m/s
  
14
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
No
  
Yes
  
α Allotropes
Not Available
  
α-Cobalt
  
β Allotropes
Not Available
  
β-Cobalt
  
γ Allotropes
Not Available
  
Not Available