Answer:
igneous
Step-by-step explanation:
This kind of rock are the ones that are formed when the magma cool down, actually it name come from "ignis" that in Latin mean fire. There are two kind of cooling down. If the process is to fast, then it will form the volcanic rock that is quite common in some old volcanoes, or the volcanoes that was erupted.
If the process of being cold was a little bit slow, so it will form some crystal rocks.
An example is the basalt rock, a common material used in building.