Metamorphic Rocks
All rocks are interrelated to each other, through the rock cycle, where the change into each other through weathering and erosion, melting and so on. Metamorphic rocks occur when rocks are transformed through heat, pressure and chemical fluids that are different from the ones that formed the original rock. Metamorphic comes from Greek and means “change form.”. Metamorphic Rocks can be classified through many different ways, and formed through many different processes. Check the links below for more specific information.
Classifying Metamorphic Rocks
Rock Cycle

Metamorphic Rock Formation==
Rocks grade
Metamorphic rocks may turn into different types of rocks or even the same type of rock, just a different kind. Metamorphic rocks form at around 12-16 kilometers deep in the ground. Even after changing into a new form, the chemical composition could be the same. One rock can actually turn into several different rocks, fro
Magma Rising
m one to another to another and so on. For example, shale turns to slate, then to phyllite, then to a mica-rich schist. Rocks can change in many ways, rocks can be put under immense pressure, there could be chemical changes and of course, the magma, all of which could change the different rocks.

Metamorphic grade

Types of Metamorphism
When magma moves through the rocks, it bakes them which changes them. This is contact metamorphism. As the temperature, depth and pressure increases, the rocks change into rocks of higher grade. but if only one increases, it becomes a different type. Hornfels is a common contact metamorphic rock, which is morphed only because of increasing heat but if there's only increasing pressure, shale will become blueschist. Increase of heat and pressure with depth causes regional metamorphism where magma rises under a large geographic area. Rocks can also form along fault lines, and then, it’s called dynamic metamorphism. Metamorphic rocks change in terms of textures and mineralogy. Also, with compaction, the mineral grains are pressed together more, and the rock becomes more dense, and less porous.

Table of Shale Metamorphism(Step by Step)




Shale changes into these minerals of higher grade, higher with increasing heat and pressure. Shale, being the lowest grade and migmatite being the highest.

Gneiss(pronounced Nice)

Uses of Metamorphic Rocks
Marble- is a metamorphic rock used for floor tiles, and is used a lot in sculptures and in the building of the Roman Coliseum.
Slate- another kind of tile, used for roofs and also floors. It was formerly used for blackboards to write on.

Work cited
Metamorphic Rocks
About Metamorphic Rocks