sedimentary
Small brown chert (flint) fragment
Microcrystalline quartz, SiO₂
AI-generated identification · may be incorrectOpaque to slightly translucent brown-gray, dull to waxy luster, no visible crystals or cleavage; hardness about 6.5–7 Mohs. The angular shape and uneven, potentially conchoidal fracture fit chert.
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Physical properties
Opaque to slightly translucent brown-gray, dull to waxy luster, no visible crystals or cleavage; hardness about 6.5–7 Mohs. The angular shape and uneven, potentially conchoidal fracture fit chert.
Formation & geological history
Silica-rich sediment consolidated into microcrystalline quartz, commonly within limestone or chalk; age and precise formation setting cannot be determined from the image.
Uses & applications
Chert has been used for prehistoric tools and can be collected or fashioned into small ornaments; this fragment is not gem-quality.
Geological facts
When struck, chert can break with sharp edges and conchoidal fracture, making it useful for stone tools.
Field identification & locations
Look for a hard, fine-grained texture and smooth, curved fracture surfaces; common in sedimentary terrains worldwide. The photo alone cannot confirm identification or locality.
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