$Flint - a fine-grained spotted aggregate of chalcedony, cryptocrystalline varieties of quartz, contains inclusions of organic residues, has a grain-shell fracture and a white porous surface crust.$

flint stone mineral

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Author: dreamstime
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File Type: JPG
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aggregate black brown chalcedony concretion crust cryptocrystalline earth element fine fire firestone flint flintstone fracture geology grain grained gray grinding hard inclusions isolated material mineral mineralogy mining nodule object organic petrography polishing porous quartz residues rock sample shape shell solid spotted stone strong surface varieties white