How to Identify Metamorphic Rocks: 12 Steps (with Pictures)
· Metamorphic rocks are formed through immense pressure and heat below the surface of the earth. Many rocks used in architecture and design are metamorphic, like slate and marble. Determining whether a rock is metamorphic, as opposed to igneous or sedimentary, can be difficult. With close attention to the grains and crystals that make up metamorphic rocks, .