Have you ever seen sinks, floors or marble sculptures? Marble is a rock formed from another rock, limestone. It is an example of metamorphic rock.
The metamorphic rocks are so named because originate from the transformation of magmatic or sedimentary rocks by processes that alter the organization of the atoms of their minerals. Then comes a new rock, with other properties and sometimes with other minerals.
Many metamorphic rocks form when rocks of another type are subjected to intense pressure or high temperatures. When, for example, due to changes in the crust, a magmatic rock is pushed deeper and higher in pressure and temperature, altering the organization of the minerals.
Slate is used as flooring
Another metamorphic rock is the slateThe, originated from clay and used in floors.
Sinks and floors can also be made of gneiss, a metamorphic rock usually originated from granite. Corcovado and Sugar Loaf in Rio de Janeiro, and most of the rocks of Serra do Mar are also gneisses.
View of the beach of the Sugarloaf hill (RJ), formed by gneiss
Gemstones or gems
Gems are very hard rocks. These are underground riches commonly known as precious stones. The deposits of emerald, ruby, Diamond and others are rare so these stones have great commercial value.
Underground, metal deposits are also found, for example, gold, iron, manganese, aluminum, zinc, copper, lead.
There are also deposits of material of organic origin, known as fossil fuels - formed from the transformation of plant and animal remains. O stone coal (coal) and the Petroleum Examples of these fuels are energy resources, ie substances used in energy production.
Some gems or gems