Jan 31, 2024 · Learn about igneous rocks in geology, including their origin, properties, and classification. Get examples and identification tips.

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

Igneous rock (igneous from Latin igneus 'fiery'), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the …

Nov 8, 2023 · The diagram below shows the classification of intrusive igneous rocks in Blue Ridge Parkway and the some of the different types of intrusive rocks beyond the three main types.

Igneous rocks are classified based on texture and composition. Texture describes the physical characteristics of the minerals, such as grain size. This relates to the cooling history of the …

Dec 24, 2025 · This results in two groups: (1) plutonic intrusive igneous rocks that solidified deep within the crust and (2) volcanic, or extrusive, igneous rocks formed at Earth’s surface.

Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies. Intrusive, or plutonic, igneous rock forms when magma is trapped deep …

Oct 19, 2023 · The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged …

Igneous rocks are classified (named) based on two sets of characteristics: Igneous rocks can be divided into four categories based on their chemical composition: felsic, intermediate, mafic, …

Igneous rocks form through the cooling of magma and lava. This comprehensive guide explains their types, classification, properties, textures, and geological formation in a clear scientific way.