Igneous Rocks

Pictures of Intrusive and Extrusive Rock Types

Igneous rocks are formed from the solidification of molten rock material. There are two basic types: 1) intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below Earth's surface; and 2) extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above Earth's surface. Pictures and brief descriptions of some common igneous rock types are shown below.

Igneous Rock Types Menu
Andesite	Basalt	Diorite	Gabbro	Granite	Obsidian
Pegmatite	Peridotite	Pumice	Rhyolite	Scoria	Tuff