You can use the characteristics(color, luster, streak, hardness, cleavage, fracture, and crystal).
When it has holes and small rocks inside the rock
the 3 ways igneous rocks are used are in schools,houses and roads. this is because they are hard,igneous rocks make useful road building materials
Increase the pressure and temperature by burying them; or heat them with an igneous intrusion.
sediment
igneous rocks
Rhyolititcen rocks.
sedimentary,metormorphic , igneous .........
throuh heat or pressure
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
Igneous rocks are formed by the solidification of molten materials.
Extrusive igneous rocks , Intrusive igneous rocks
All rocks can become igneous rocks. With weathering and erosion, an igneous rock can become a sediment. Then with compaction and cementation, it can become a sedimentary rock. With heat and pressure, it will turn into a metamorphic rock. Or it can melt and turn into an igneous rock. There are many more ways rocks can change types... that is the rock cycle.