The primary texture of igneous rocks formed from cooling lava is aphanitic or extrusive. When lava cools quickly upon reaching the Earth's surface, it solidifies into small crystals that are often not visible to the naked eye, resulting in a fine-grained texture. Common examples include basalt and obsidian. In contrast, if cooling occurs slowly beneath the surface, larger crystals may form, leading to a coarse-grained texture known as phaneritic. Understanding these textures aids in identifying igneous rocks and comprehending their formation processes.