Metamorphic rocks are classified into two major textures based on their appearance and the arrangement of their mineral grains. Foliated metamorphic rocks exhibit a layered or banded appearance, which occurs due to the alignment of minerals under directed pressure. This texture can often be seen in rocks like schist and gneiss. On the other hand, non-foliated metamorphic rocks do not have a layered appearance; their mineral grains are not aligned and can be more uniform in texture. Examples of non-foliated rocks include marble and quartzite. Understanding these textures helps in identifying and classifying metamorphic rocks in geology.