What are some examples of plutonic igneous rocks?

As an example, a rock with the same composition could be called gabbro if it were plutonic, diabase if it were intrusive, or basalt if it were extrusive. Whereas plutonic rocks form continents, basalt lies in the crust underneath the oceans. read more

Metallurgical ContentGranitePegmatiteApliteGraphic Granite GreisenSyeniteNepheline-syenite DioriteGabbroNoriteDiabasePeridotiteDunite or olivine-rockKimberlite or blue ground It is strongly recommended that these descriptions and examples of plutonic rocks be read with the specimens in hand, obtainable, as noted before, from the Geological Survey. read more

Intrusive igneous rocks (plutonic) are formed from magma that cools and solidifies within the crust of a planet. Surrounded by pre-existing rock (called country rock), the magma cools slowly, and as a result these rocks are coarse grained. read more