sedimentary
Likely flint (chert) fragment
Chert, microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectSmall brown-gray angular fragment with a dull to slightly waxy surface; likely Mohs hardness 6.5–7, with no visible crystals or cleavage and a conchoidal fracture. The image is too small to confirm its material or properties.
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Physical properties
Small brown-gray angular fragment with a dull to slightly waxy surface; likely Mohs hardness 6.5–7, with no visible crystals or cleavage and a conchoidal fracture. The image is too small to confirm its material or properties.
Formation & geological history
Chert forms when silica accumulates and hardens, commonly in marine sediments; its age varies widely by deposit. The fragment’s specific geological age and source cannot be determined from the image.
Uses & applications
Chert has been used for stone tools and, when suitable, as a silica source; this tiny fragment has no evident commercial or jewelry use.
Geological facts
Chert fractures into sharp-edged flakes, which made it useful for prehistoric cutting tools.
Field identification & locations
Look for a hard, fine-grained texture and curved, shell-like fracture surfaces; common sources include limestone and chalk regions. A close-up or hardness and streak tests would help distinguish it from other fragments.
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