sedimentary
White flint (chert)
Microcrystalline quartz, SiO₂
AI-generated identification · may be incorrectMostly white to pale gray, with a dull-to-waxy luster and irregular, curved conchoidal fractures. Hardness is about 7 Mohs; crystals are too fine to see, and cleavage is absent.
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Physical properties
Mostly white to pale gray, with a dull-to-waxy luster and irregular, curved conchoidal fractures. Hardness is about 7 Mohs; crystals are too fine to see, and cleavage is absent.
Formation & geological history
A silica-rich sedimentary rock formed when dissolved silica replaced or accumulated in marine sediments, often as nodules in chalk or limestone. Its exact age and source cannot be determined from the image.
Uses & applications
Flint has been used historically for tools and sparks; today, chert is mainly a collecting material and may be used decoratively.
Geological facts
The sharp edges produced by conchoidal fracture made flint valuable for prehistoric cutting tools.
Field identification & locations
The pale, waxy-looking surface and shell-like fracture are consistent with flint, though the image alone cannot confirm the identification. Flint occurs in chalk and limestone regions worldwide; this piece appears rough and unpolished.
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