sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, dull to waxy luster, conchoidal fracture, and typically grey, white, or brown in color.
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Physical properties
Hardness of 7 on Mohs scale, dull to waxy luster, conchoidal fracture, and typically grey, white, or brown in color.
Formation & geological history
Formed through the chemical precipitation of silica from aqueous solutions or the accumulation of siliceous skeletal remains in marine environments.
Uses & applications
Historically used for making stone tools and weapons due to its sharp edges when fractured; modern use includes decorative landscaping.
Geological facts
Chert breaks with a distinct conchoidal fracture, creating extremely sharp edges that made it invaluable to early humans. Varieties include flint, jasper, and agate.
Field identification & locations
Identify in the field by its high hardness, smooth weathered surface, and conchoidal breakage patterns. Commonly found in limestone deposits and riverbeds worldwide.
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