What is the most common mineral group in the earths crust

The silicates

Explanation:

The silicates are the most common mineral groups on the earth crust. They account for a bulk 90% of all rocks and earth materials we find on our thin crust.

The silicates are made of the fundamental unit which is the SiO₄⁴⁻ tetrahedron. This forms the basic unit through which other elements combine with them. The silicates makes up the bulk of sands we have as silica.

The tetrahedron makes silicates unique and able to combine readily with other elements to form a wide range of minerals.

Most rocks found on the earth surface and in the crust are for their most parts made up of silicate minerals. Some of these minerals are olivine, quartz, beryl, phlogopite, feldspars etc.