sedimentary
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Dark gray to black. Luster: Waxy to dull. Fracture: Distinctive conchoidal fracture with sharp edges. Structure: Microcrystalline quartz.
- Hardness
- 7 on Mohs scale
- Color
- Dark gray to black
- Luster
- Waxy to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Dark gray to black. Luster: Waxy to dull. Fracture: Distinctive conchoidal fracture with sharp edges. Structure: Microcrystalline quartz.
Formation & geological history
Formed through biochemical or chemical precipitation of silica in deep-marine or limestone environments. This specimen was knapped by human hands into a point.
Uses & applications
Historically used for tools, weapons, and fire-starting. Modern uses include jewelry, decorative wire-wrapped pendants, and lapidary collections.
Geological facts
Chert and flint break with extremely sharp, razor-thin conchoidal edges, which made them the premier materials for knapping ancient tools, arrowheads, and spear points.
Field identification & locations
Look for microcrystalline quartz texture, hardness capable of scratching glass, and scalloped conchoidal knapping flakes on knapped points. Found globally in limestone formations.
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