Metamorphic rocks typically do not form in distinct layers like sedimentary rocks. Instead, they often exhibit a foliated or non-foliated texture due to the alignment of minerals under pressure and temperature changes. Foliated metamorphic rocks, such as schist or slate, may show a banded appearance, but this is a result of mineral alignment rather than layering. Non-foliated metamorphic rocks, like marble, lack any such banding and do not display layering.
metamorphic rocks
They form when layers of minerals lay on top of each other
non-foliated.
They form when layers of minerals lay on top of each other
They form when layers of minerals lay on top of each other
metamorphic rocks
Pressure through layers of crust
They form when layers of minerals lay on top of each other
non-foliated.
They form when layers of minerals lay on top of each other
They form when layers of minerals lay on top of each other
Foliated rocks have layers in them. We often refer to the layers as Banding.
Foliated metamorphic rocks form through directed pressure and heat acting on existing rocks, causing minerals to align in a preferred orientation. This alignment creates distinct layers or bands within the rock, giving it a foliated texture. Examples of foliated metamorphic rocks include schist, gneiss, and slate.
Sedimentary rocks, and foliated metamorphic rocks form in layers.
Sedimentary rocks form from layers of sand, silt or clay, sometimes mixed with pebbles, and the bodies of living things (that may the be fossilised) The rocks are often quite soft. Metamorphic rocks form when rocks (usually sedimentary rocks) are subjected to extreme heat and/or pressure, usually deep underground. The rocks are changed in form, often becoming harder. Fossils are usually destroyed by the process.
Metamorphic rocks can form from both igneous and sedimentary rocks
Metamorphic rocks can form from both igneous and sedimentary rocks