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A grayish-blue metallic substance, silicon is hard yet brittle and belongs to semiconductor materials. It is the second most abundant element in the Earth’s crust, primarily found in the form of sand, rocks, and minerals. Silicon has a wide range of applications, including in construction materials such as cement, bricks, concrete, ceramics, and glass, industrial uses like wear-resistant materials, high-strength ceramics, and in steelmaking and aluminum casting. In the technology industry, high-purity silicon is a core material for semiconductors, and nearly all computers and smartphones rely on it.