sedimentary
Chert Pebble with Quartz Vein
Microcrystalline Quartz (SiO2)
Hardness 6.5-7 on the Mohs scale, waxy to sub-vitreous luster, smooth rounded pebble form, yellowish-brown body with white opaque quartz filling thin fracture veins.
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Physical properties
Hardness 6.5-7 on the Mohs scale, waxy to sub-vitreous luster, smooth rounded pebble form, yellowish-brown body with white opaque quartz filling thin fracture veins.
Formation & geological history
Formed in marine or freshwater sedimentary environments via chemical precipitation of microcrystalline silica. Later smoothed by water action in riverbeds, lakes, or coastal beach areas.
Uses & applications
Commonly collected as river rocks, used in landscaping, polished in rock tumblers, or used historically for knapping flint tools.
Geological facts
Quartz veins form when mineral-rich hydrothermal fluids flow through fractures in host rocks, precipitating silica crystals as the solution cools and crystallizes.
Field identification & locations
Easily identified by its hardness (scratches glass), smooth water-worn texture, conchoidal fracture pattern, and distinct white quartz veining running through the tan/brown chert body.
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