Which rock is NOT a foliated metamorphic rock?

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Multiple Choice

Which rock is NOT a foliated metamorphic rock?

Explanation:
Foliation happens when directed pressure causes minerals to realign into flat, parallel layers. Rocks that show this texture, like slate, schist, and gneiss, have minerals arranged in sheets or bands due to the orientation of stress during metamorphism. Marble forms when limestone is subjected to heat, and the calcite minerals recrystallize into interlocking grains. This creates a uniform, non-layered texture rather than aligned layers, so marble does not develop foliation. So, the rock that is not foliated among the options is marble.

Foliation happens when directed pressure causes minerals to realign into flat, parallel layers. Rocks that show this texture, like slate, schist, and gneiss, have minerals arranged in sheets or bands due to the orientation of stress during metamorphism.

Marble forms when limestone is subjected to heat, and the calcite minerals recrystallize into interlocking grains. This creates a uniform, non-layered texture rather than aligned layers, so marble does not develop foliation.

So, the rock that is not foliated among the options is marble.

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