'Rock on!  This, composed of silicon dioxide, is the most abundant mineral in the continental crust'
quartz
THE NATURE OF THINGS: Rock on!  This, composed of silicon dioxide, is the most abundant mineral in the continental crust
Rock on!  This, composed of silicon dioxide, is the most abundant mineral in the continental crust
Rock on!  This, composed of silicon dioxide, is the most abundant mineral in the continental crust
THE NATURE OF THINGS
quartz
THE NATURE OF THINGS