There are different kinds of rocks. A metamorphic facies (minerals) form only within specific temperature and pressure ranges and allows geologists to establish the metamorphic grade of a rock.
This is known as a combination of different kinds of mineral in metamorphic rocks and they are known to be formed under the same pressures and temperature.
They are the typical set up (assemblage) of minerals present in the rocks and are created at specific compositions of temperature and pressure.
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