How are minerals different from rocks?

The mineral has a unique chemical composition and is necessarily determined by its crystal structure and shape. On the other hand, since a rock can be composed of several minerals, it is classified according to the process of its formation. The rock can also contain organic debris and mineraloids besides the usual mineral formations. There are some rocks that can only include one mineral formation. The classification of rocks also depends on their mineral and chemical composition, texture and formation process. Therefore the stones are classified as igneous, sedimentary and metamorphic.