sedimentary
Yellow Chert
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Yellow to tan; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 6
- Color
- Yellow to tan
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to tan; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed through the accumulation of silica-rich microfossils or chemical precipitation in sedimentary environments. Can be found in various geological ages ranging from Precambrian to Cenozoic.
Uses & applications
Historical use for stone tools and arrowheads; modern use in landscaping, lapidary projects, and road construction material.
Geological facts
Chert was one of the most important raw materials for early humans because its conchoidal fracture allows it to be shaped into sharp edges. Yellow varieties are often colored by iron oxide (limonite).
Field identification & locations
Identify by its waxy appearance and shell-like (conchoidal) fracture surfaces. Commonly found in limestone or dolomite beds as nodules.
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