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Physical Properties of Cobalt and Gold

Cobalt
Gold
Physical Properties of Gold and Cobalt


Physical Properties
Melting Point
1,495.00 °C   
29
1,064.43 °C   
99+
Boiling Point
2,870.00 °C   
34
2,807.00 °C   
36
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Gold   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
5.00   
8
2.50   
14
Brinell Hardness
470.00 MPa   
26
194.00 MPa   
99+
Vickers Hardness
1,043.00 MPa   
11
216.00 MPa   
31
Speed of Sound
4,720.00 m/s   
14
2,030.00 m/s   
99+
Optical Properties
  
  
Reflectivity
67.00 %   
11
95.00 %   
2
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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