Properties of Molybdenum Molybdenum is a silver-white refractory metal with a melting point of 2615°C and a density of 10.2 g/cm3. Its coefficient of expansion is small, almost the same as that of the special glass for electron tubes, about 4.8 µm·m−1·K−1 (25 °C). Molybdenum is very stable at room temperature. When it is higher