Here's why:
* Foliation refers to the parallel alignment of mineral grains in a metamorphic rock. This alignment occurs due to the intense pressure and heat during metamorphism, causing the minerals to recrystallize in a preferred direction.
* Non-foliated metamorphic rocks lack this parallel alignment. Their mineral grains are randomly arranged, giving them a more uniform appearance.
Some examples of non-foliated metamorphic rocks include:
* Marble: Formed from limestone or dolostone.
* Quartzite: Formed from sandstone.
* Hornfels: Formed by contact metamorphism.
Let me know if you have any other questions about metamorphic rocks!
