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Watch the Neocrystallization topic of the Metamorphic Change Animation. The protolith of the rock undergoing neocrystallization is a mudstone. As metamorphism proceeds, it is turned into a metamorphic rock called a schist. Based on what you can see in the animation, which of the following occur(s) during this transition? Choose one or more: A. Existing minerals undergo plastic deformation. B. Neocrystalline garnets form. C. Existing minerals become elongated and take on a foliation. D. Neocrystalline garnets are compressed. E. Existing minerals shrink in length.

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Answer:

C. Existing minerals become elongated and take on a foliation.

Explanation:

The process in which a metamorphic rock undergoes metamorphism into shale is called "schistosity". Schistosity can be described as a foliation process that can happen at medium or high levels of metamorphism. The important thing to remember about this process is that, during the metamorphism of the metamorphic rock, the minerals become tabular and elongated, assuming a medium granularity that makes them visible to the naked eye. these minerals line up in the same direction, allowing the rock to assume smooth or wavy planes on its surface.

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