sedimentary
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, yellowish-brown to tan color, waxy to dull luster, conchoidal fracture, smooth water-worn texture with thin white quartz veins.
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Physical properties
Hardness of 7 on Mohs scale, yellowish-brown to tan color, waxy to dull luster, conchoidal fracture, smooth water-worn texture with thin white quartz veins.
Formation & geological history
Formed through the accumulation and recrystallization of microcrystalline silica in marine sedimentary environments, later rounded by river or beach water erosion.
Uses & applications
Commonly used in landscaping, river rock decor, aggregate for construction, and lapidary tumbling.
Geological facts
Chert was historically prized by prehistoric cultures for making stone tools, arrowheads, and spark-striking flints due to its sharp conchoidal fracturing.
Field identification & locations
Identified in the field by its high hardness (scratches glass), smooth waxy feel, rounded pebble shape, and distinct milky white quartz veins cutting through the body.
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