sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, vitreous luster, conchoidal fracture, and colorless to white or grey color.
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Physical properties
Mohs hardness of 7, vitreous luster, conchoidal fracture, and colorless to white or grey color.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent quartz-bearing rocks.
Uses & applications
Used in landscaping, decorative gravel, and as aggregate in construction materials.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving weathering longer than almost any other mineral.
Field identification & locations
Easily identified by its resistance to scratching by steel and smooth, water-worn shape found in riverbeds and beaches.
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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
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Shale
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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