Igneous rocks pictures

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.

Scoria is a dark colored, extrusive igneous rock with a vesicular texture.

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 molten magma from which it came. Composition refers to the rock’s specific mineralogy and chemical composition. Cooling history is also related to changes that can occur to the composition of igneous rocks.

Granite is the most widely known igneous rock. It is an intrusive rock with visible grains of feldspar, quartz, mica, and amphibole minerals. It is durable and widely used in construction and architecture.

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Conglomerate is a clastic sedimentary rock composed of rounded clasts that are over two millimeters in size and bound together by a cement that is usually composed of calcite or quartz.

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

Andesite is an extrusive igneous rock with a mineral composition between granite and basalt. It is named after the Andes Mountains, where it is very abundant.

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.

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