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Flint Pebbles Silica

Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestonesnside the nodule, flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance thin layer on the outside of the nodules is usually different.

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