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Igneous Rocks Are Classified on the Basis of What Two Main Characteristics?

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.

Igneous Rocks Are Classified on the Basis of What Two Main Characteristics?

Igneous rocks are classified on the basis of two main characteristics: texture and composition. Texture refers to the size, shape and arrangement of the crystals in a rock, while composition refers to the type and amount of minerals present.

There are three main types of igneous rocks: intrusive, extrusive and pyroclastic. Intrusive rocks have large crystals and are found deep in the Earth‘s crust, while extrusive rocks have small crystals and are found on the Earth‘s surface.

Pyroclastic rocks are made up of fragments of other rocks and are found in volcanic areas. The most common igneous rocks are granite, basalt, and andesite.

Granite is an intrusive rock with large crystals and a variety of colors, while basalt is an extrusive rock with small crystals and a dark color.

Andesite is an intrusive rock with large crystals and a moderate amount of color. Igneous rocks are used in a variety of ways. They are used in construction, as decorative rocks, and as a source of minerals.

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