In Geology, the natural transformation that certain minerals and also some rocks of the earth's crust are called metamorphism, due to variations in pressure and temperature

The first mention of the concept of metamorphism does not appear until the mid-18th century, when James Hutton, in his book Teory of the Earth (1795), suggests that the burial at great depths of some sedimentary rocks, produces its transformation into gneisses and shales .

The concept of metamorphism groups all the processes of mineralogical and structural transformation of rocks in solid state, in response to a variation of the pressure and temperature conditions that prevailed at the time of their formation.

The main factors involved in metamorphic reactions are the increase in temperature, due to the increase in depth, the friction of a fault or the proximity of a plutonic intrusion and the increase in pressure as a result of burial or stress caused by stress. tectonics

Metamorphic reactions produce changes in the texture and composition of rocks, with the formation of new minerals, so that chemical changes are favored by the presence of fluids, such as water and gases.

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