uses of metamorphic rocks

These minerals, known as index minerals, include sillimanite, kyanite, staurolite, andalusite, and some garnet. It is due to the introduction of chemicals from other surrounding rocks.

Metamorphic rocks produced during collisions between oceanic and continental plates from different localities around the world also show striking similarities to each other (see below Regional metamorphism) yet are markedly different from metamorphic rocks produced during continent-continent collisions. Igneous Rocks: Examples and Uses. A metamorphic even-granular grain to medium grained and may be uneven granular and coarse grained in calc-silicate rock.

[4], There is also a tendency for metasomatism between the igneous magma and sedimentary country rock, whereby the chemicals in each are exchanged or introduced into the other. For example, slate is a foliated metamorphic rock, originating from shale.

Marble. Marble is formed from limestone and contains tiny interlocking grains.

The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. The specific shape of the geotherm beneath any location on Earth is a function of its corresponding local tectonic regime. Read about our approach to external linking. Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite. Metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. [4], In a few cases rocks are fused and in the dark glassy product minute crystals of spinel, sillimanite and cordierite may separate out. Write a short paragraph describing each of the two rocks (thus two paragraphs). The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. Garnet just happens to be my birthstone. Contortion or crumbling of the foliation is by no means uncommon; splitting faces are undulose or puckered. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.The protolith may be a sedimentary, igneous, or existing metamorphic rock.
Regardless of which process occurs, the result is that a collection of minerals that are thermodynamically stable at the initial conditions are placed under a new set of conditions at which they may or may not be stable. When a rock is contact altered by an igneous intrusion it very frequently becomes more indurated, and more coarsely crystalline. Shale . It is a hard crystalline rock and has many uses. The normal color is white but accessory minerals act as coloring agents and may produce a variety of colors. Along the mineral layers composed of soft or fissile minerals the rocks will split most readily, and the freshly split specimens will appear to be faced or coated with this mineral; for example, a piece of mica schist looked at facewise might be supposed to consist entirely of shining scales of mica. Any that were present in the original sedimentary rock will not normally survive the heat and pressure. Schist is another metamorphic rock that is formed from either mud or shale.

Metamorphic rocks are used for roofing material, decorative gardening stone, the base for snooker tables, building material, sculpture material and paving material. Dark bands represent material composed predominantly of biotite and minor hornblende. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. [2] They are classified by texture and by chemical and mineral assemblage (metamorphic facies). Likewise, the metamorphic rocks exposed in the Alps are grossly similar to metamorphic rocks of the same age in the Himalayas of Asia, which formed during the continental collision between the Indian and Eurasian plates. Some geologists use the term "quartzite" to refer to metamorphic rocks consisting almost exclusively of quartz. It is convenient to think of gneiss as a rock with parallel, somewhat irregular banding that has little tendency to split along planes. Metamorphic Rocks Laboratory.
The layering within metamorphic rocks is called foliation (derived from the Latin word folia, meaning "leaves"), and it occurs when a rock is being shortened along one axis during recrystallization. Metamorphic rocks are therefore distributed throughout the geologic column. This results in a banded, or foliated rock, with the bands showing the colors of the minerals that formed them. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". However it can be used for garden decoration, paving and sometimes sculpture. Granites may absorb fragments of shale or pieces of basalt. Marble is used for statues and decorative items like vases (Figure).

Rocks can be metamorphosed simply by being at great depths below the Earth's surface, subjected to high temperatures and the great pressure caused by the immense weight of the rock layers above.


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