Here's why:
* Metamorphic rocks: These are rocks that have been transformed by heat, pressure, and/or chemical reactions from their original form (igneous, sedimentary, or even other metamorphic rocks).
* Foliation: This refers to the development of layers or bands in a metamorphic rock due to the alignment of minerals under pressure. Think of it like a deck of cards being squeezed, the cards will align themselves.
Non-foliated metamorphic rocks do not exhibit this layering. Instead, the mineral grains within the rock may grow larger or recrystallize, but they remain randomly oriented.
Examples of non-foliated metamorphic rocks include:
* Marble: Formed from the metamorphism of limestone.
* Quartzite: Formed from the metamorphism of sandstone.
* Hornfels: Formed from the contact metamorphism of various rocks by an intrusion of magma.
* Anthracite: A type of coal that has undergone metamorphism.
Let me know if you have any other questions about metamorphic rocks!
