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The main component of crystalline silicon is silicon dioxide, but silicon dioxide is everywhere. Is crystalline silicon still valuable? What is the commercial value of crystalline silicon?
Although the chemical composition is the same, their physical properties and commercial value are completely different because of their different crystal structures. Ordinary silicon dioxide is amorphous white powder, which can only be used in general chemical rubber materials. However, crystal is a transparent crystal with various crystal structures, and some crystals show different colors because they contain some other elements, so it has high commercial value in optical instruments, jewelry, handicrafts and so on.

The same example is diamonds. The chemical composition of diamond is carbon, so is the chemical composition of graphite, and the chemical composition of ordinary charcoal is still carbon. However, due to the different crystal structures, their commercial values are far from each other.

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