Metamorphic Rocks
- How they form
- When igneous rock or sedimentary rock are buried deep under the Earth surface and they are under ton and tons of pressure, then heat builds up and then it changes into a metamorphic rock.
- Foliated & Nonfoliated
Uses
Some uses of metamorphic rocks are building, sculpting, flooring, roofs, and chalk boards.
Gneiss is foliated metamorphic rock. It typically contains abundant quartz or feldspar minerals. It is high grained. Some uses of gneiss are flooring, gravestones, counter tops, and building materials.
Quartzite is a non-foliated metamorphic rock that is made from sand stone. Quartzite has a glassy texture. Also it has a glassy and greasy luster most of the time. Some uses for quartzite are railway, decorating stone, walls, roofing tile, and steps.
Phyllite is a foliated metamorphic rock. It is fine-grained. The surface of phyllite is typically lustrous and sometimes wrinkled. Some uses for Phyllite are counter tops and building materials
Slate is a foliated metamorphic rock that is formed through the metamorphism of shale. Slate breaks into thin pieces, so in other turns slate has cleavage. Slate is used for roofing, building materials, and sidewalks / walkways. Also slate has a earthy luster.