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As soon as magma or lava hardens, it would be classified as an igneous rock.
Examples of igneous rock are pumice, basalt, rhyolite, and granite.
There are two classifications of igneous rocks: extrusive, those formed on the surface, and intrusive, those formed underground. The most common igneous rock is basalt, follow…ed by granite. Types of variations of these two alone are very high in number.
Four examples of igneous rocks are pumice, granite, basalt, and obsidian.
Extrusive-formed on surface Intrusive-formed underground
Volcanic rocks are extrusive igneous rocks.
I believe that igneous rocks are made up of igneous rocks.
Obsidian is an extrusive felsic volcanic glass.
limeston Nova Net [♥ it]
Igneous Rock consists of three elements:- Liquid PortionSolids if any are silicate mineralsVolatile
Any rock that erupted on (lava) or within the Earth or crystallized from molten rock (magma). Such rock would fall into two categories: Intrusive (crystallized within the …Earth), granite, gabbro, diorite, pegmatite, peridotite and extrusive (erupted and crystallized on the surface) rhyolite, andesite, obsidian, basalt, tuff and pumice.