sedimentary
Chert Arrowhead
Cryptocrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dull to waxy luster, conchoidal fracture, and typically gray, brown, or black coloration.
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Physical properties
Hardness of 7 on the Mohs scale, dull to waxy luster, conchoidal fracture, and typically gray, brown, or black coloration.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich solutions during the Cenozoic or older geological periods, later shaped by human flaking.
Uses & applications
Used historically as a primitive tool for hunting and cutting, and collected today as a valued artifact of indigenous craftsmanship.
Geological facts
This specimen is a manufactured artifact carved from a sedimentary rock using the process of flintknapping.
Field identification & locations
Identified by its sharp worked edges and conchoidal fracture, commonly found in agricultural fields and river valleys worldwide.
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