- Sapphire is a gemstone that contains Al2O3. Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide with trace amounts of elements such as iron, titanium, chromium, vanadium.
- Sphalerite is ore of zinc. The molecular formula of sphalerite is ZnS.
- In the concentration of Galena (PbS) ore, sodium cyanide is added as depressant for zinc sulphide (ZnS).
- Corundum is a mineral of aluminium with a molecular formula Al2O3.
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