What is the most common mineral in the earths crust? Why? What hazards are associated with it?

Quartz

Explanation:

Quartz is the most abundant mineral on the earth crust. From sedimentary rocks through igneous and metamorphic rocks, the mineral abounds. Also, a large amount of quartz makes up sand particles in soils.

Quartz is a frameworks silicate mineral formed by interlocking silica grains. It is highly abundant in different forms on the surface of the earth.

Quartz is a safe mineral because it causes not hazard to the environment and life. It is widely used in filter beds for water purification, for construction and making glasswares.