# Why do igneous rocks have crystals?

Oct 25, 2015

Crystals are formed from magma's cooling rate. Igneous rocks are formed near volcanoes after a volcanic eruption.

#### Explanation:

The texture of an igneous rock depends on the time it takes the rock to harden.

The slower the cooling rate is, the larger the crystals will form. $\rightarrow$ these are intrusive rocks or familiarly called coarse-grained.

If the cooling rate is fast, small crystals will form. $\rightarrow$ these are called fine grained igneous rocks.