sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
Hardness: 6.5-7 Mohs; Color: Brown, tan, and white; Luster: Waxy to dull; Cleavage: None (conchoidal fracture); Crystal: Microcrystalline/Cryptocrystalline.
- Hardness
- 6
- Color
- Brown, tan, and white
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brown, tan, and white; Luster: Waxy to dull; Cleavage: None (conchoidal fracture); Crystal: Microcrystalline/Cryptocrystalline.
Formation & geological history
Formed by the precipitation of silica from groundwater or the accumulation of silica-rich organic remains in marine environments. This specimen has been anthropogenically worked into a tool through a process called knapping.
Uses & applications
Originally used as a hunting tool or weapon. Today it is a valuable archaeological find and a desired object for historical and geological collectors.
Geological facts
This is a projectile point, often colloquially called an arrowhead. It shows clear signs of bifacial flaking and intentional shaping. Many such specimens date back hundreds to thousands of years depending on the region and style.
Field identification & locations
Identify by the conchoidal fracture scars, sharp edges, and symmetrical shape. Look for percussion and pressure flaking marks on the surface that indicate it was man-made from raw lithic material.
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