sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
Hardness: 6.5-7. Color: Grey, tan, or white with waxy luster. Conchoidal fracture. Cryptocrystalline structure. Specific gravity: 2.6.
- Hardness
- 6
- Color
- Grey, tan, or white with waxy luster
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Physical properties
Hardness: 6.5-7. Color: Grey, tan, or white with waxy luster. Conchoidal fracture. Cryptocrystalline structure. Specific gravity: 2.6.
Formation & geological history
Formed in marine environments through the precipitation of silica or the accumulation of siliceous organism remains like diatoms or radiolarians.
Uses & applications
Historically used for stone tools and weapons (arrowheads). Today used as a component in road construction and as a decorative landscaping rock.
Geological facts
Because it breaks with a conchoidal fracture, it creates sharp edges that made it the primary material for prehistoric survival tools.
Field identification & locations
Identify by its smooth, waxy surface and sharp, curved fracture patterns. It is extremely hard and will scratch glass easily.
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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