give one difference between ferrous and nonferrous minerals
Non-ferrous metal Generally more expensive than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g. aluminium), higher conductivity (e.g. copper),[1] non-magnetic property or resistance to corrosion (e.g. zinc).[2] Some non-ferrous materials are also used in the iron and steel industries. For example, bauxite is used as flux for blast furnaces, while others such as wolframite, pyrolusite and chromite are used in making ferrous alloys.[3]
Iron The mechanical properties of iron and its alloys can be evaluated using a variety of tests, including the Brinell test, Rockwell test and the Vickers hardness test. The data on iron is so consistent that it is often used to calibrate measurements or to compare tests.[7][8] However, the mechanical properties of iron are significantly affected by the sample's purity: pure, single crystals of iron are actually softer than aluminium,[6] and the purest industrially produced iron (99.99%) has a hardness of 20–30 Brinell.[9] An increase in the carbon content will cause a significant increase in the hardness and tensile strength of iron. Maximum hardness of 65 Rc is achieved with a 0.6% carbon content, although the alloy has low tensile strength.[10] Because of the softness of iron, it is much easier to work with than its heavier congeners ruthenium and osmium.[11]