Uranium
U
atomic number
92
melting point
1132.2°C

1. Mix a small portion of powdered mineral with sodium metaphosphate flux, then apply the blowpipe flame to the mixture using a platinum wire loop; in the oxidizing portion of the flame, the molten bead will take on a yellow color that turns to a yellowish-green as the bead cools; in the reducing portion of the flame, the bead turns a beautiful green which remains unchanged upon cooling.