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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.
Rockhound. The alignment of minerals into bands (foliation) is caused by the massive force of pressure and high temperature which results from mountain building processes caused by plate collisions.inerals in metamorphic rocks go through pressure and heat. The layers, called foliation, are created perpendicular to the forces being applied;therefore, layers are created. + 7 others found this useful.