List of rock types 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, …

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 …

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

A clear, scientifically grounded overview of what rocks are, how the three major rock types form, and why rock classification matters in geology and engineering.

Figure B: A simplified classification diagram for igneous rocks based on their mineral compositions. Note that glassy igneous rocks pumice and obsidian are not included on this …

CLASSIFICATION The classification of rocks is based on two criteria, TEXTURE and COMPOSITION. The texture has to do with the sizes and shapes of mineral grains and other …

Jun 19, 2025 · Below is a list of major rock types that geologists recognize. While there are many rock classifications (some overlapping), several terms and principles have remained widely …

This chapter presents a system for the identification and classification of rocks and includes standard terminology and descriptive criteria for physical properties of engineering …

Feb 12, 2024 · Igneous rocks form when molten rock (magma) originating from deep within the Earth solidifies. The chemical composition of the magma and its cooling rate determine the …

Rocks on earth are classified according to the way they were formed. Igneous rocks come from magma or lava. Sedimentary rocks are made from sediments. Metamorphic rocks are the …