Minerals and Rocks
A mineral is an inorganic body, formed by the process of nature, usually having a definite composition. If formed under favourable conditions, it has a crystalline form and other physical properties. Soil scientists, however, often include inorganic, amorphous (non crystalline) components found in soil within the term soil mineral. Plant scientists also use minerals to connote those essential plant nutrients derived from the soil. Based on origin, minerals are classified into two groups, primary and secondary.