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An igneous rock is one formed from the cooling and solidification of magma or lava. Examples include basalt, rhyolite, pumice, scoria, granite, diorite, gabbro, and obsidian. â¦ Magma solidifying under the surface results in coarser grained intrusive igneous rock.
Igneous rocks are rocks formed from the crystallization of a liquid (molten rock). Igneous rocks may be divided into two categories. Intrusive or plutonic rocks crystallize from magma beneath the earth's surface.gneous Rocks. Of the three principal rock types (igneous, sedimentary, and metamorphic), igneous rocks can be thought of as primary rocks because they crystallize from a liquid. Sedimentary and metamorphic rocks, which we will study later, may be thought of as derivative rocks.