sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, translucent to transparent, vitreous luster, hexagonal crystal system (cryptocrystalline or macrocrystalline depending on variety), conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, translucent to transparent, vitreous luster, hexagonal crystal system (cryptocrystalline or macrocrystalline depending on variety), conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through weathering and erosion of parent rocks containing quartz, followed by transport via water (rivers, streams, or ocean waves) which smooths and rounds the edges into a pebble.
Uses & applications
Used in landscaping, decorative gravel, tumbling, lapidary arts, and occasionally in glassmaking or construction aggregates.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to both mechanical weathering and chemical decomposition allows it to survive long transportation journeys, forming smooth pebbles commonly found in riverbeds and beaches.
Field identification & locations
Can be identified by its inability to be scratched by a steel knife (due to its Mohs hardness of 7) and its characteristic conchoidal fracture. Found globally in alluvial deposits, river gravels, and sedimentary formations.
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