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Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned. These rocks develop a platy or sheet-like structure that reflects the direction that pressure was applied in. Slate, schist, and gneiss (pro...
Foliation is a geologic term that is used to describe the banded or layered appearance of metamorphic rocks. Foliated metamorphic rocks such as gneiss display banding and re â¦ grouping of its mineral constituents as a result of enormous pressures and heat.on-foliated rocks do not have distinct layers or bands. These rocks, such as quartzite, marble, and soapstone, often are. more even in color than foliated rocks. If the mineral grains are. visible at all, they do not seem to line up in any particular direction.