Rhodium is an extremely rare and precious silver metal. It belongs to platinum group elements and has corrosion resistance. This metal is used as a catalyst in the chemical industry to coat optical fibers, optical mirrors and headlight mirrors. The largest rhodium producers are South Africa, Russia and Canada.

2. Platinum

This precious metal is used in jewelry and many industrial applications, including fuel cells, dentistry, electronic components, medical care, glass and petroleum. South Africa, Russia, Canada and other mineral processing countries are the largest producers of precious metals.

3. golden

Gold is the most recognizable precious metal because of its unique color. As a commodity collection and transaction, it is used in jewelry, industrial application and dental application. Its conductive composition is the key to the electronic industry. The main sources of gold mining are South Africa, the United States, China, Australia and Russian.

4. ruthenium

As a member of the platinum family, it is popular because it can increase hardness and resistance. Ruthenium is widely used in jewelry, electronics, chemical industry and other industries, with strong fire resistance and brittleness. The largest producers include Russia, North America and South America.

5. Iridium (Ir)

This metal has a high melting point and is the most corrosion-resistant metal. Iridium is widely used in the manufacture of electrical contacts, precision chemical balances and surgical instruments. Iridium is a by-product of nickel mining and is also extracted from platinum ore. Although it has many uses, it is mainly used as a hardener for platinum alloys.