sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, white to translucent color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
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Physical properties
Mohs hardness of 7, white to translucent color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent quartz veins or pegmatites, rounding into pebbles in high-energy fluvial or marine environments.
Uses & applications
Used in landscaping, decorative stone, aggregate in construction, and as raw material for glass and silicon production.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's surface, allowing it to survive millions of years of erosion.
Field identification & locations
Easily identified by its resistance to steel scratching (hardness 7) and smooth water-worn shape, commonly found in riverbeds and beaches worldwide.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary