The most common mineral element in Earth's crust is Silica, in a  percentage of 27 point seven percent, the second most abundant  mineral is Aluminum, with an eight percent … and third Iron, with a  five percent.Answered. In Earth Sciences.xygen and silicon are the two most common ELEMENTS in the Earth's crust. These two elements bond to create silicates, which are the most abundant GROUP OF MINERALS in the Ear … th's crust.