Neither tungsten or molybdenum are not found naturally. Tungsten has to be separated from one of the mineral elements (iron, manganese, and calcium) in which it is combined in its natural state. Molybdenum has to be separated from molybdenite or found as a trace element in copper. After separation, Tungsten and molybdenum are compressed into metallic powders at a very high pressure. Then they are most often used to make alloys. They are used to increase strength, hardness, electrical conductivity and resistance to corrosion and wear.