Metamorphic rocks and the process of their formation

Extreme heat or extreme pressure causes rocks to be crushed or boiled to change their shape into metamorphic rocks. These rocks are compressed by tectonic forces. Can be heated by the infiltration of its molten magma. There are different grades of metamorphism , that form rocks that are harder and more crystalline at each stage.

Mountain slate

The force that connects the silt layer in the mountain ranges also compresses the rock itself. They twist the soft shell so much that their minerals break down and crystals form again in thin layers. That is, a slate is a rock that is harder than a shell, but which easily divides between layers with a cleavage plane. These are very useful for making thin, light and weatherproof roof tiles.

(Slate quarry:- The Snowdonia Mountains in Wales are an important source of high quality roofing slate).

Sparkling schist

Increasing heat and pressure can cause slate and other rocks to turn into hard metamorphic rocks called schist. Like slate, schist also has flat crystals, all aligned in the same way. This causes the faces of the crystals to glow with the reflected light. Some types of cysts also contain garnet crystals that have grown from the minerals of the original rock.

Banded gneiss

In the subduction zone that destroys the edges of tectonic plates, intense pressure and extreme heat form a highly compressed metamorphic rock called a guinea fowl. The rocks usually have dark and pale stripes of crystals that are crushed and deformed. The oldest known rocks are the planets formed about 4 billion years ago.

Roasted rock

The upwelling magma that cools under the ground cooks the rocks around it. The result is mineral crystals appearing on a hard rock called Hornfels. Around this igneous infiltration they are known as metamorphic orioles. Copper, lead, and silver metals are also found in the rock.

(Heat treatment:- A mass of hot magma is pushed into existing rocks and replaces them).

Quick facts

>Many metamorphic rocks are formed at temperatures of 900° F (500 ° C) or higher. Almost high enough to melt it.

>The converted sandstone turns into extremely hard rock called quartzite which is literally pure quartz.

>Although marble is durable, it can be dissolved with lemon juice and even acid rain, thus damaging the marble masonry.

>Precious metals and gems are often formed by the process of forming metamorphic rocks.

Nice marble

Marble is a modified rock made of limestone. The original rock is repositioned by high temperatures and high pressures, which is why most marble is found in the mountains. Marble can have many colors. Most often with complex patterns. But some marbles, such as the Carrara marble from Tuscany, Italy, are pure shiny white.

(The artist’s stone:- Exquisite white and carved marble has been used for many famous sculptures).

Deep heat

Before being replaced by heat or pressure or both, most metamorphic rocks were silt rocks, such as shale, sandstone, or limestone. But igneous rocks can go through the same process. These include mantle rock peridotite, which can transform into serpentinite and ecologite. These are formed by applying deep pressure to the rock in the subduction zone between the colliding plates of the Earth’s crust.

(Mantle rock:- This serpentine, found in Cyprus, is formed from rocks in the oceanic crust).

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