Nickel
Ni
atomic number
28
melting point
1455°C

1. Roast a small quantity of powdered mineral on a charcoal block using the oxidizing portion of a blowpipe flame, then mix a small amount of the roasted sample with borax flux and reapply the blowpipe flame to the mixture; in the oxidizing portion of the flame, the fused bead is a beautiful violet color while hot which turns to a reddish-brown color when cool; in the reducing portion of the flame, the fused bead turns gray, then becomes clouded with metallic nickel until the bead is completely opaque.

2. Dissolve a small quantity of powdered mineral sample in a nitric acid solution; most nickel-bearing minerals will give a distinctive apple-green color to the solution; add ammonia to excess and the solution will turn blue.