answersLogoWhite

0

The difference in crystal sizes between the two types of formations is of interest to geologists. Quickly cooling lava leaves little time for crystal formation of the minerals in the ensuing extrusive igneous rock. Obsidian, a volcanic glass, sometimes results from extremely rapid cooling of lava. Slower cooling lava will result in crystal formation, albeit small crystal formation, resulting in an aphanitic texture. The largest crystal formation in igneous rock occurs when magma cools underground and very slowly, over hundreds of thousands of years.

User Avatar

Wiki User

16y ago

What else can I help you with?