The rocks found on the earth’s surface are being divided into different parts on the basis of their origin, duration and composition.
This classification of rocks is being presented in the following table:
Description of Metamorphic Rocks
Definition of Metamorphic Rocks: The different types of rocks made by the basic changes in the properties and structure of the original rocks without their disintegration and dissociation are called Metamorphic Rocks.
Cause of Metamorphism: Metamorphism of the original rocks is due to the effect of mainly water, heat and pressure.
Features of Metamorphic Rocks: Metamorphic rocks are the secondary rocks. These are harder than the original rocks. These rocks are non – porous. Metallic minerals are found in abundance in these rocks.
Classification of metamorphism of the Metamorphic Rocks: Metamorphism of the Metamorphic Rocks are classified into four parts: Thermal Metamorphism, Regional Metamorphism, Hydro Metamorphism and Thermo – Hydro Metamorphism.
Thermal Metamorphism occurs due to extreme high heat. Regional Metamorphism occurs due to compression and heat. Hydro Metamorphism occurs due to action water on chemical materials. Thermo – Hydro Metamorphism occurs due to action of water vapor and pressure.
Classification of Metamorphic Rocks: On the basis of the original rocks, due to whose metamorphism the Metamorphic Rocks are made.
The rocks are being classified into the following parts:
| Original Rock |
Metamorphic Rock |
| Granite |
Gneiss |
| Basalt |
Amphibolite |
| Gabbro |
Serpentine |
| Sandstone |
Quartzite |
| Limestone |
Marble |
| Shale |
Slate |
| Coal |
Graphite and Diamond |
Re – metamorphism of few Metamorphic Rocks like:
| Metamorphic Rock |
Re – metamorphic Rock |
| Slate |
Schist |
| Schist |
Phylite |
