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Cobalt
Cobalt

Chromium
Chromium



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Cobalt
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Chromium

Physical Properties of Cobalt and Chromium

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Physical

Melting Point

1,495.00 °C1,857.00 °C
-38.83 3410
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Boiling Point

2,870.00 °C2,672.00 °C
0 5660
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Appearance

Physical State

Solid
Solid

Color

Gray
Silver

Luster

Metallic
Metallic

Hardness

Mohs Hardness

5.008.50
0.2 8.5
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Brinell Hardness

470.00 MPa687.00 MPa
0.14 3490
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Vickers Hardness

1,043.00 MPa1,060.00 MPa
0 3920
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Speed of Sound

4,720.00 m/s5,940.00 m/s
818 16200
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Optical Properties

Refractive Index

2.502.97
0.155 3.41
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Reflectivity

67.00 %70.00 %
5 97
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Allotropes

α Allotropes

α-Cobalt
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β Allotropes

β-Cobalt
-

γ Allotropes

-
-