Metamorphic rocks are used for roofing material, decorative gardening stone, the base for snooker tables, building material, sculpture material and paving material. Metamorphic rocks come in three different types: slate, marble and schist.Know More
Slate starts out as shale under the surface of the Earth before its metamorphosis. It is typically gray in color and splits along long flat planes. It is also does not allow water or other liquids to pass through it. Slate is most often used as a roofing material, decorative gardening stone and a base for snooker tables. In the Victorian era, it was commonly used as a writing board.
Marble is another one of the metamorphic rocks and is a metamorphosed limestone. It has a hard crystalline rock appearance and was the stone of choice in ancient Greece. In fact, more than 22,000 tonnes of marble were used to build the ancient Greek Parthenon and marble remains a popular building and sculpture material today. It can also be ground down to make cleaning products or soaps.
Schist is another metamorphic rock that is formed from either mud or shale. However, it is formed at a much higher temperature than slate is. Schist is a fairly weak rock so it does not make for a good building material. It is used for paving and occasionally sculpture.Learn more about Geology
Pressure that shapes rocks to align in particular directions causes foliation, according to the Mineralogical Society of America. When such differential pressure acts on the forming rocks, it produces layers of rocks that run in parallel to each other, creating the diagnostic banded appearance of foliated rocks.Full Answer >
Foliated metamorphic rocks are rocks that have gone through extreme temperature and pressure changes, resulting in a different chemical composition. They are distinct for the appearance of a layered pattern throughout the rock.Full Answer >
Metamorphic rocks are primarily classified according to mineral composition and texture, similar to how igneous or sedimentary rocks are classified. However, the forces that form metamorphic rocks, namely pressure, heat and chemically active fluids, can produce a wide range of different substances, which makes classifying these rocks much more difficult.Full Answer >
Non-foliated metamorphic rocks are rocks that have been changed by heat and pressure into rocks with a non-layered or banded appearance. Some examples of non-foliated metamorphic rocks include quartzite, marble, amphibolite and hornfels.Full Answer >