sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, grey, or clear, vitreous to dull luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, grey, or clear, vitreous to dull luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, commonly found in riverbeds, beaches, and conglomerate sedimentary formations.
Uses & applications
Used in landscaping, construction aggregate, glassmaking raw material, and as a common specimen for amateur rock collectors.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving weathering processes that destroy almost all other minerals.
Field identification & locations
Can be easily identified by its high hardness (scratches glass), smooth rounded shape from water tumbling, and lack of cleavage. Found globally in alluvial deposits.
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Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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