Physical Properties of Neptunium and Beryllium
Melting Point
1,278.00 °C
  
36
Boiling Point
3,902.00 °C
  
13
2,970.00 °C
  
32
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silver
  
White Gray
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
1,670.00 MPa
  
4
Speed of Sound
Not Available
  
12,890.00 m/s
  
2
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available