Cement, glass and ceramics are all traditional silicate materials, and their raw materials are mainly silicon dioxide. Why is this sentence wrong?

Although all three are silicates, this question is not the main components of the three, but the "raw materials"!

The raw materials used to produce these three products are as follows:

Cement: limestone and clay

Ceramics: clay

Glass: limestone, soda ash and quartz sand.

Among them,

The main component of limestone is calcium carbonate (CaCO3).

Composition of clay:

Kaolinite:

Stone grease:?

Montmorillonite:

Vermiculite:

Or?

Elise:?

Diaspore: Al2O3. Silicon dioxide ·5h2o///

The main component of quartz sand is silicon dioxide.