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Q: Why don't all rocks have foliation?
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Do all metamorphic rocks have layers?

No. The layering or foliation only occurs when there is a variation in the composition of the original rock. If the rock is homogeneous, then there will be no foliation.


Do all metamorphic rocks show foliation?

No. Non-foliated metamorphic rocks include quartzite and marble.


What are planar rocks?

Rocks that show bedding or foliation.


What type of rock often have foliation?

Metamorphic rocks often have foliation. Schist is a common example.


Foliated rocks are distinguished by?

The main way metamorphic rocks are classified is by the presence or absence of foliation. Foliated metamorphic rocks are distinguished by the type of foliation they exhibit. Types of foliation textures, include: slaty, phyllitic, schistose, and gneissi.


What describes the thin flat layering found in most metamorphic rocks?

The thin flat layering found in most metamorphic rocks is called foliation


Foliation is caused by?

Foliation in rocks refers to the process being split into thin sheets. It is caused by intense pressure that shapes rocks to align in particular directions.


What is nonfoliated texture?

Metamorphic rocks that do not exhibit foliation.


What major group does foliated rocks belong?

Foliation is a characteristic of some metamorphic rocks.


Where do foiliated rocks form?

Foliation occurs deep underground.


How do foliated rocks break?

Usually along the plane of foliation.


What two things are necessary for foliation to form in a metamorphic rock?

presence of platy mineral and orientation stress can give foliation to a metamorphic rocks.