Native Elements Gold, Silver, Copper, etc. are rare, but precious. Minerals in Earth Earth's core is mainly iron and nickel with a small amount of a lighter element, perhaps oxygen or sulfur. The Mantle is almost completely silicate, and is rich in magnesium. The minerals of olivine and pyroxene are most common, and an aluminum-bearing mineral. Xenoliths Ophiolites Earth has two types of crust - oceanic and continental.
Oceanic crust is composed of basalt, the result of partial melting of the mantle.
It is rich in Mg, Fe, Ca, Al which are in the minerals olivine, pyroxene plagioclase feldspar. The elements are concentrated in low-density minerals such as quartz and feldspar.