Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (150 megapascals (1,500 bar)), causing profound physical or chemical change.
https://en.wikipedia.org/wiki/Metamorphic_rock
Pictures of Metamorphic Rock Types. Metamorphic rocks are those that form by the effects of heat, pressure and shear upon igneous and sedimentary rocks. Some form during mountain-building by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism.
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Metamorphic rock. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form.[1] The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (150 megapascals (1,500 bar))[clarify],[2] causing profound physical or chemical change.
https://en.wikipedia.org/wiki/Metamorphic_rock
For instance, starting with a mudstone, the following sequence develops with increasing temperature: slate is a very fine-grained, foliated metamorphic rock, characteristic of very low grade metamorphism, while phyllite is fine-grained and found in areas of low grade metamorphism, schist is medium to coarse-grained and found in areas of medium grade metamorphism, and gneiss coarse to very coarse-grained, found in areas of high-grade metamorphism.
https://en.wikipedia.org/wiki/Metamorphic_rock
Because of the role played by water, metamorphic rocks generally contain many elements absent from the original rock, and lack some that originally were present. Still, the introduction of new chemicals is not necessary for recrystallization to occur.
https://en.wikipedia.org/wiki/Metamorphic_rock
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (150 megapascals (1,500 bar)) [clarify], causing profound physical or chemical change.
https://en.wikipedia.org/wiki/Metamorphic_rock
Amphibolite is a rock composed mostly of amphibole minerals. Usually, it's a hornblende schist like this as hornblende is the commonest amphibole. Amphibolite forms when basaltic rock is subjected to higher temperatures between 550 C and 750 C) and slightly greater pressure range than that which yields greenschist.
https://www.thoughtco.com/metamorphic-rock-types-4122981
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock is subjected to heat and pressure, causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by texture and by chemical and mineral assemblage. They may be forme
https://en.wikipedia.org/wiki/Metamorphic_rock
For example, slate is a foliated metamorphic rock, originating from shale. Non-foliated rock does not have planar patterns of strain. Rocks that were subjected to uniform pressure from all sides, or those that lack minerals with distinctive growth habits, will not be foliated.
https://en.wikipedia.org/wiki/Metamorphic_rock
Metamorphic rocks are those that form by the effects of heat, pressure, and shear upon igneous and sedimentary rocks. Some form during mountain-building by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism.
https://www.thoughtco.com/metamorphic-rock-types-4122981
what is something about metamorphic rock
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form.