sedimentary
Chert / Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: yellowish-brown to tan, waxy to vitreous luster, conchoidal fracture, microcrystalline structure
- Hardness
- 7 on Mohs scale
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Physical properties
Hardness: 7 on Mohs scale; Color: yellowish-brown to tan, waxy to vitreous luster, conchoidal fracture, microcrystalline structure
Formation & geological history
Formed through the accumulation of microcrystalline silica in marine or lacustrine sedimentary environments
Uses & applications
Historically used for flaking into tools and arrowheads; currently used in aggregate construction, gravel, and lapidary collecting
Geological facts
Chert is extremely durable and weather-resistant, often surviving stream transport better than surrounding softer rocks
Field identification & locations
Identified by its hardness (scratches glass), smooth conchoidal fracture, and lack of visible mineral grains. Widespread in riverbeds, gravel bars, and sedimentary rock formations worldwide
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