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- a microcrystalline silicate rock similar to chert, used for the manufacture of flaked stone tools. Color most commonly gray, honey-brown, or black.
- A quartz with a high silica content that produces a conchoidal fracture when chipped. It is usually found in association with chalk, limestone, and other rock deposits which contain lime. It commonly occurs in small ovoid nodules as well as in larger veins. Impure flint is known as chert, which varies widely as to texture, color, grain, and knapping characteristics. Pure flint is so hard and even-grained that is use by early man was a vital necessity in producing spear point, dart point, knives and other utilitarian tools. Late stone-age man learned that when struck with a high iron content rock, the flint gave off sparks. Thus, flint became Iron-Age man's method of producing fire. Flint comes in many colors from white to black including gray, tan, brown, olive, blue, and other variants and mottled combinations.
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