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Most metamorphic rocks form deep below the Earth’s surface. These rocks are formed from either igneous or sedimentary rocks, making them a changed… What is metamorphic foliation and how does it form? Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned. TheseRead More →

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Foliated (Banded) Metamorphic Rocks Rocks without distinct alternating bands of light and dark minerals are described a nonlayered, whereas rocks with alternating bands of dark and light minerals are described as layered. Layered is also referred to as gneissic foliation. Do foliated rocks have banding? Some foliated rocks are alsoRead More →