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Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer may be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin folium, meaning leaf, and refers to the sheet-like planar structure.
This only happens when there is directed pressure; confining pressure does not accomplish it. The diagram illustrates the effect. A texture of this sort in a metamorphic rock is called FOLIATION and the rocks are said to be FOLIATED.3. FLUIDS serve only to speed up other metamorphic processes, or perhaps even allow them to happen at all. Chemical reactions require water, and most proceed much faster as the amount of water goes up. texture of this sort in a metamorphic rock is called FOLIATION and the rocks are said to be FOLIATED. 3. FLUIDS serve only to speed up other metamorphic processes, or perhaps even allow them to happen at all. Chemical reactions require water, and most proceed much faster as the amount of water goes up.