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The presence of aligned minerals in the rock determines if it is foliated or non-foliated. Foliated metamorphic rocks have minerals that are arranged in layers or bands, while non-foliated rocks do not show any preferred orientation of minerals. The amount of pressure and temperature the rock experiences during metamorphism also influences whether it will develop a foliated or non-foliated texture.
A rock with minerals aligned into bands or layers.
Metamorphic rocks with a layered or banded look are referred to as foliated.
Non foliated rocks, such as marble, form from limestone, a common type of sedimentary rock. Foliated rocks form from metamorphic or igneous rocks. Non Foliated rocks are more brittle than foliated rocks making them more susceptible to breakage.
Foliated or nonfilated
Breccia is typically a nonfoliated rock, meaning that it lacks the aligned mineral grains or bands characteristic of foliated rocks. Breccia forms from the cementation of broken rock fragments, giving it a distinct angular appearance.
Foliated is the correct answer!!!
Coal is a nonfoliated metamorphic rock. It does not have a planar arrangement of minerals and lacks the distinct layering seen in foliated rocks like slate or schist.
Foliated texture
The geologist could see that the metamorphic rock was non foliated as it did not contain aligned minerals in bands.
Gneiss is a foliated metamorphic rock, meaning it has visible layers or bands of different minerals. These layers are formed due to the intense pressure and temperature conditions that gneiss undergoes during the metamorphic process.