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Foliation is a primary structure of which type of rock?

(a) Igneous rock

(b) Sedimentary rock

(c) Metamorphic rock

(d) Not associated with any rock

I have been asked this question in class test.

My question is from Rocks Basic Terms in portion Structural Features of Rocks of Engineering Geology

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Correct choice is (c) Metamorphic rock

To explain I would say: Stratification and lamination are the most common primary structures of sedimentary rocks; crystalline structure is typical of igneous rocks and foliation is a typical primary structure of metamorphic rocks.

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