sedimentary
Chert (Yellow Jasper/Honey Chert)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Waxy honey-yellow to golden-brown; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Waxy honey-yellow to golden-brown
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Waxy honey-yellow to golden-brown; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the accumulation of silica-rich organic remains or chemical precipitation in sedimentary environments. Often found as nodules in limestone or chalk beds.
Uses & applications
Historically used for stone tools and arrowheads due to its sharp edges; currently used for lapidary art, jewelry, and as a collector's specimen.
Geological facts
Chert was one of the first materials used by early humans for fire-starting and tool-making because it breaks with incredibly sharp, durable edges.
Field identification & locations
Identify by its waxy appearance, ability to scratch glass, and smooth, curved shell-like (conchoidal) fractures. Found worldwide in sedimentary basins.
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