Foliated metamorphic rocks exhibit a layered or banded appearance, often formed by pressure in the Earth's crust. Examples include Gneiss, Phyllite, and Schist. Quartzite, on the other hand, is a non-foliated metamorphic rock formed by the metamorphism of pure quartz sandstone, making it the correct answer. While foliated rocks are often used in making decorative stones and for building materials, Quartzite, due to its hardness and resistance to weathering, is often used as a dimension stone in construction and decorative applications.
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