What does none-foilated mean?

Answer 1

Non-foliated refers to a type of metamorphic rock that does not exhibit a layered or banded appearance, which is typical of foliated rocks. Instead, non-foliated rocks have a more uniform texture and composition, often resulting from the random interlocking of mineral grains. Common examples include marble, which is formed from limestone, and quartzite, which originates from sandstone. The absence of foliation occurs because the minerals in non-foliated rocks are typically subjected to uniform pressure and temperature conditions during metamorphism.