Some rocks are very common on earth. Large portions of the continents consist for example of granite and basalt covers almost all of the oceanic crust. Other rocks are formed only when very specific ...

Igneous and metamorphic petrology represent two fundamental branches of geological science that elucidate the formation, transformation, and evolution of Earth’s solid materials. Igneous petrology ...

Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also ...