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Understanding Metamorphic Rocks and Their Foliation Types

Metamorphic rocks undergo recrystallization due to heat and pressure, leading to significant changes in their mineral composition and structure. This process results in various types of foliation. Slaty foliation exhibits fine banding that is difficult to see, while schistose foliation has more apparent bands of medium grain size. Gneissic foliation shows pronounced banding with larger grains. Common examples of metamorphic rocks include slate, phyllite, schist, and gneiss, each showcasing unique properties and foliations indicative of their formation processes.

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Understanding Metamorphic Rocks and Their Foliation Types

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  1. Metamorphic Rocks

  2. Recrystallization- when minerals grow and change (due to heat and pressure) Slaty foliation- fine: banding very small and hard to see with naked eye Schistose foliation- fine to medium: banding apparent Gneissic foliation- medium to coarse: banding very pronounced

  3. Slate

  4. Phyllite

  5. Schist

  6. Gneiss

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