Different types of rocks formed by the basic changes in the properties and structure of the original rocks without their disintegration and dissociation are called Metamorphic Rocks. These original rocks can be igneous, sedimentary or even metamorphic. This metamorphism is due to the effect of water, heat and pressure.
The igneous and sedimentary rocks are metamorphosed, and few metamorphic rocks are also re – metamorphosed. In this metamorphism, in addition to the complete change in the shape of rocks, the structure of minerals also changes. In this, new shape of old minerals can be formed, new minerals can be formed, rocks can take another shape, granular size of rocks can be changed.
