What are the two most common minerals located in Earth's crust

Quartz and Feldspar are the two common minerals in the earths crust

Quartz is hard white or colorless mineral consisting of silicon dioxide, found widely in igneous metamorphic, and sedimentary rocks. It is often colored by impurities.

Feldspar is an abundant rock froming mineral typically ocurring as colorless or pale colored crystals and consisting of alluminosilicates of potasium, sodium, and calcium

The one most common mineral is the feldspar, which takes up 60 % of the weight, and the second most common is quartz. Both have silicon and oxygen in them.