Why Would Granite Have Larger Crystals Than Igneous Rocks

Igneous rocks can have many different compositions depending on the magma they cool from.

Why would granite have larger crystals than igneous rocks.

Igneous rocks form when magma molten rock cools and crystallizes either at volcanoes on the surface of the earth or while the melted rock is still inside the crust. Because crystals in granite had more time to form as the magma cooled slowly. The large grains are called phenocrysts and rock with phenocrysts is called a porphyry that is it has a porphyritic texture. The crystals in granite being intrusive in nature will be larger than those in basalt an extrusive igneous rock.

It depends on the type of igneous rock. I think igneous rock have a larger crystal than all the others because igneous rock is all the way at the bottom of. In many igneous rocks large mineral crystals float in a fine grained groundmass. The more time crystals have to form the more likely they are going to be larger in size.

Intrusive igneous rocks have cooled slowly from magma extrusive rocks have. Why would granite have larger crystals than igneous rocks formed from lava cooled above earth s surface 1055913. Phenocrysts are minerals that solidified earlier than the rest of the rock and they are important clues to the rock s history. Intrusive igneous rocks have cooled slowly from magma extrusive rocks have.

Because crystals in granite had more time to form as the magma cooled slowly. The crystals in granite being intrusive in nature will be larger than those in basalt an extrusive igneous rock. Crystals that form on the surface are tiny because they cooled very quickly. Intrusive igneous rocks such as granite have large crystals extrusive igneous rocks may have small crystals as in basalt or no crystals as in pumice.