In the mining sector, Brazil stands out in the extraction of iron ore (the second highest world exporter), copper, gold, bauxite (one of the five largest producers in the world), manganese (one of the five largest producers in the world), tin (one of the largest producers in the world), niobium (concentrates 98% of reserves known to the world) and nickel. In terms of precious stones, Brazil is the world's largest producer of amethyst, topaz, agate and one of the main producers of tourmaline, emerald, aquamarine and garnet.