They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.
Hard and Blunt
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
Many igneous rocks are hard, dense, and durable. This makes them great for tools and building materials.
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igneous rocks
hard rough and not smooth
Igneous rock is considered "hard" rock by geologists due to its interlocking crystalline structure.
Rhyolititcen rocks.
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
Igneous, Metamorphic, and Sedimentary rocks
Igneous rocks are formed by the solidification of molten materials.