sedimentary
Chert / Flint (Artifact)
Microcrystalline quartz (SiO2)
Hardness: 7 on Mohs scale. Color: Brownish-gray with weathering patina. Luster: Waxy to dull. Crystal structure: Cryptocrystalline quartz (chalcedony/chert). Fracture: Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Brownish-gray with weathering patina
- Luster
- Waxy to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Brownish-gray with weathering patina. Luster: Waxy to dull. Crystal structure: Cryptocrystalline quartz (chalcedony/chert). Fracture: Conchoidal fracture.
Formation & geological history
Formed through the chemical precipitation of silica in marine environments (such as chalk or limestone deposits) or biochemical accumulation of siliceous skeletal remains over millions of years.
Uses & applications
Historically used extensively by prehistoric humans to fashion stone tools, arrowheads, spear points, and blades due to its sharp conchoidal fracture properties.
Geological facts
This specimen appears to be a human-crafted lithic artifact (such as a hand axe or biface tool) chipped from sedimentary chert or flint, showing deliberate percussion flaking.
Field identification & locations
Identified in the field by its distinctive conchoidal fracture, hard microcrystalline texture, and evidence of human retouching or flaking along the edges. Found globally near limestone and chalk formations.
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