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Calcium
Calcium

Thorium
Thorium



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Calcium
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Thorium

Physical Properties of Calcium and Thorium

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Physical

Melting Point

839.00 °C1,750.00 °C
-38.83 3410
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Boiling Point

1,484.00 °C4,790.00 °C
0 5660
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Appearance

Physical State

Solid
Solid

Color

Gray
Silver

Luster

-
-

Hardness

Mohs Hardness

1.753.00
0.2 8.5
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Brinell Hardness

170.00 MPa390.00 MPa
0.14 3490
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Vickers Hardness

170.00 MPa295.00 MPa
0 3920
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Speed of Sound

3,810.00 m/s2,490.00 m/s
818 16200
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Optical Properties

Refractive Index

1.541.60
0.155 3.41
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Reflectivity

60.00 %15.00 %
5 97
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Allotropes

α Allotropes

-
-

β Allotropes

-
-

γ Allotropes

-
-