Igneous rock is a type of rock formed from the cooling and solidification of MAGMA (5 letters). Examples of igneous rocks include syenite (7 letters), LAVA (4 letters), diabase (7 letters), diorite (7 letters), BASALT (6 letters), GRANITE (7 letters), porphyry (8 letters), gabbro (6 letters), sima (4 letters), norite (6 letters), and obsidian (8 letters). Igneous rocks are formed when molten material cools and solidifies, either at the surface or underground. They are classified based on their mineral composition and texture.