Zinc
Zn
atomic number
30
melting point
419.53°C

1. Roast a small amount of finely powdered mineral on a charcoal block using the oxidizing portion of a blowpipe flame, then mix the mineral powder with a bit of sodium carbonate flux and a drop or two of distilled water, place some of the paste in a platinum wire loop and apply the blowpipe flame while holding the sample just above a charcoal block; when exposed to the reducing portion of the flame, a yellow coating will form on the charcoal which turns white when cool; (if the sublimate is moistened with cobalt nitrate solution and reignited, the zinc-bearing silicates will turn blue to bluish-green while all other zinc-bearing compounds turn a beautiful apple-green).

2. Expose a large mineral fragment to a hot flame using a lamp, candle, or Bunsen gas burner, (be sure to hold the fragment in the center of the flame); most zinc-bearing compounds impart a vivid bluish-green tint to the flame.

3. Pulverize a few mineral fragments into a fine powder, then place the powder in a large test tube and gently heat the sample using a lamp, candle, or Bunsen gas burner; many zinc-bearing minerals assume a yellowish color when gently heated in this fashion, but are white when cool.