Physical Properties of Uranium and Actinium
Melting Point
1,132.00 °C
  
39
1,227.00 °C
  
38
Boiling Point
3,818.00 °C
  
16
3,200.00 °C
  
26
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Gray
  
Silvery White
  
Luster
Metallic
  
NA
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
2,350.00 MPa
  
2
Not Available
  
Vickers Hardness
1,960.00 MPa
  
2
Not Available
  
Speed of Sound
3,155.00 m/s
  
25
Not Available
  
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available