Igneous rock is a type of rock, not a specific type within a broader category.

Here's how to think about it:

* Rock types: There are three main types of rocks: igneous, sedimentary, and metamorphic.

* Igneous rock: This is one of those main types. It forms from the cooling and solidification of magma (molten rock) or lava (magma that has erupted onto the surface).

So, igneous rock is a category of rock, not a specific type within another category.