Metamorphic rock
The metamorphic rocks are formed by the Recristallisation (and generally the deformation) of sedimentary rocks or magmatic rocks under the action of the temperature and of the pressure which grow with the depth in the Earth's crust or in contact with other rocks. It is thanks to the change of the initial conditions of temperature (and sometimes of pressure) that the Métamorphisme is set up. Indeed, the chemical components lose or gain a molecule of water (H2O) what involves a chemical reorganization, and thus mineralogical, rock.
They have very different characteristics according to their composition, the temperature reached, speed and the manner with which they cool. What gives more than 700 varieties different of metamorphic rocks.
Among the metamorphic rocks, one finds in particular:
- the Schist S and Mica schist S
- the Cipolin S
- the Gneiss
- the Granite S of anatexie.
Simple: Metamorphic rock'n'roll
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