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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...
Rockhound. Foliation is a geologic term that is used to describe the appearance of metamorphic rocks. Foliated metamorphic rocks such as gneiss display banding and regrouping of its mineral constituents as a result of enormous pressures and heat. The banding forms perpendicularly to the direction of pressure.on-foliated metamorphic rocks such as quartzite and marble do not display the banding or layering that are present in foliated rocks. This may be partially due to the high relative percentage of one individual mineral in the parent rock, as well as to the metamorphic variables of heat and pressure.