Igneous rock

Learn more about the major types of igneous rock, which includes plutonic, intrusive, and extrusive igneous rocks.

It’s amazing how much can be seen and read from the rocks if you know what to look for! That’s one of the beauties of being a geologist. Three major groups of rocks are: igneous, metamo…

Difference Between Rocks and Minerals

Trap rock is a construction industry term for dark-colored igneous rocks such as basalt, gabbro, and diabase that are used to make crushed stone.

Photographs and descriptions of intrusive and extrusive igneous rocks with photos and links to detailed articles by Geology.com

Igneous rocks are one of three main rock types, formed when magma or lava cool & solidify. Because this process can happen many different ways, igneous rocks can look very different. Igneous rocks can differ in size, shape, distribution of mineral grains, color, etc. Here's an image of some different kinds of igneous rocks and their classifications.

Though geodes may look like ordinary rocks, they conceal a hollowed interior that is chock full of different colored minerals and rocks such as amethyst, quartz, agate, and jade. Geodes form naturally over time as a result of specific...

Learn more about the major types of igneous rock, which includes plutonic, intrusive, and extrusive igneous rocks.

Learn more about the major types of igneous rock, which includes plutonic, intrusive, and extrusive igneous rocks.

Learn about the three types of rock, and see photo examples of each.