sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
Hardness: 7 Mohs scale; Color: Reddish-brown with tan inclusions; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 7 Mohs scale
- Color
- Reddish-brown with tan inclusions
- Luster
- Waxy to vitreous
Identified More sedimentary →
Explore Chert Arrowhead in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 Mohs scale; Color: Reddish-brown with tan inclusions; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed via the accumulation of siliceous remains of marine organisms or through chemical precipitation in limestone/dolomite. This specimen was anthropogenically worked into an arrowhead.
Uses & applications
Historically used as a projectile point for hunting; today it serves as a valuable archaeological artifact and collector's item.
Geological facts
Chert and flint were preferred by prehistoric peoples worldwide because they break with extremely sharp edges through a process known as knapping.
Field identification & locations
Identified by its triangular shape, flaked edges (scars from pressure flaking), and conchoidal fracture patterns. Found in archaeological sites and riverbeds in limestone-rich areas.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary