Physical Properties of Erbium and Niobium
Melting Point
1,522.00 °C
  
28
Boiling Point
2,510.00 °C
  
99+
2,468.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Gray
  
Luster
Lustrous
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Speed of Sound
2,830.00 m/s
  
28
3,480.00 m/s
  
21
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available