sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or translucent, with a vitreous to dull luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or translucent, with a vitreous to dull luster and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and water transport of quartz veins or granitic rocks, often deposited in riverbeds or beaches over millions of years.
Uses & applications
Used in landscaping, decorative stone, and as raw material for aggregate and glassmaking.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness (scratches glass) and smooth, water-worn shape. Found worldwide in stream beds, beaches, and conglomerate rock formations.
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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
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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)
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