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.
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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.
Formation & geological history
Formed through the mechanical weathering and water transportation of parent quartz veins or igneous rocks, rounded over long periods in fluvial or marine environments.
Uses & applications
Used in landscaping, decorative stone, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness, lack of cleavage, and resistance to scratching by steel; found universally in riverbeds, beaches, and gravel deposits.
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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)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary