The following is a list of rock types recognized by geologists. There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or …

Jul 9, 2023 · Learn about the three types of rocks: igneous, sedimentary, and metamorphic. Learn their characteristics and get examples of each type.

Dec 29, 2025 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form …

Jun 19, 2025 · List of all Igneous, Sedimentary, and Metamorphic Rock Types with Pictures and Links to Specific Articles about each Type of Rock.

Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com

There are three basic types of rock: igneous, sedimentary, and metamorphic. Extremely common in the Earth's crust, igneous rocks are volcanic and form from molten material.

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

Each of these rock types relies on the others in some way. Take a few minutes to watch this fun video that describes the three types of rock and how they are connected.

The three main rock types are igneous, sedimentary, and metamorphic. Crystallization, erosion and sedimentation, and metamorphism transform one rock type into another or change sediments into rock.

Aug 26, 2025 · What a rock is made of, the shapes of the grains, and how the grains fit together all provide valuable clues to help us unlock the rock's history hidden within. Rocks are divided into three …