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Igneous Rocks

May 4, 2013
Igneous rocks

Igneous rocks are established from the solidification of molten rock material. There are two primary types:

  • Invasive igneous stones such as diorite, gabbro, marble and pegmatite which strengthen below earth’s surface; and
  • Extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above Earth’s area.

The rocks are not all the same. Some are large, while some are mild. On the other hand, some are black, while some can be almost genuine white-colored. Moreover these rocks which are all formed from magma are present in the Earth’s mantle layer.

How these rocks form?

Igneous stones are known as fire stones which are recognized by either subterranean or above the ground. In subterranean, they are formed when the melted rock, known as magma, strong within the world becomes stuck in small pockets. As these pockets of magma cool progressively subterranean, the magma becomes igneous stones.

They are also formed when volcanoes appear, resulting in the magma to increase above the earth’s surface. When magma seems to be above the world, it is called lava. Igneous stones are formed as the lava cools down above the ground.

Various facts of igneous rock

  • There are 700 different types of igneous rocks.
  • Basalt, granite are the examples of igneous rocks.
  • Granite which is used for construction purpose contains atleast 25% quartz.
  •  Tuff is a rock formed from volcanic ash.

Composition of igneous rock

Structure of igneous stones is effectively determined by dedication of the rock’s substance composition, which needs chemical equipment and devices that are not available in this lab. For igneous rocks determination of chemical composition is not required. Color is often an indicator of the composition of a stone or mineral and can be successfully used to recognize the composition of most igneous stones. Light colors, such as white, light gray indicate a felsic composition. Dark colors, such as black and darkish, indicate a mafic or ultramafic composition.

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