Physical properties

Phase at STP

solid

Melting point

505.08 K ​(231.93 °C, ​449.47 °F)

Boiling point

2875 K ​(2602 °C, ​4716 °F)

Density (near r.t.)

white, β: 7.265 g/cm³
gray, α: 5.769 g/cm³

when liquid (at m.p.)

6.99 g/cm³

Heat of fusion

white, β: 7.03 kJ/mol

Heat of vaporization

white, β: 296.1 kJ/mol

Molar heat capacity

white, β: 27.112 J/(mol·K)