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Flint is a hard, impure variety of quartz, typically gray to black, known for producing sparks when struck with steel. This property made it crucial for tools and weapons during the Stone Age. Flint is a type of chert, a fine-grained silica mineral. Its uniform grain and brittleness allowed early humans to shape sharp tools by flaking. Today, crushed flint serves as an abrasive in sandpapers and in industries that grind raw materials for ceramics and paints, as it avoids iron contamination.12

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