Igneous rock

Rocks do not have a definite composition of mineral constituents. Feldspar and quartz are the most common minerals found in rocks. There are many different kinds of rocks which are grouped under three families on the basis of their mode of formation.

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

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.

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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.

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