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Physical Properties of Cobalt and Iridium

Cobalt
Iridium
Physical Properties of Iridium and Cobalt


Physical Properties
Melting Point
1,495.00 °C   
29
2,410.00 °C   
7
Boiling Point
2,870.00 °C   
34
4,527.00 °C   
10
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
5.00   
8
6.50   
5
Brinell Hardness
470.00 MPa   
26
1,670.00 MPa   
5
Vickers Hardness
1,043.00 MPa   
11
1,760.00 MPa   
3
Speed of Sound
4,720.00 m/s   
14
4,825.00 m/s   
13
Optical Properties
  
  
Reflectivity
67.00 %   
11
78.00 %   
6
Allotropes
Yes   
No   
α Allotropes
α-Cobalt   
Not Available   
β Allotropes
β-Cobalt   
Not Available   
γ Allotropes
Not Available   
Not Available   
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