sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to pale yellow color, vitreous luster, hexagonal crystal system when unweathered, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to pale yellow color, vitreous luster, hexagonal crystal system when unweathered, conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, rounding off sharp edges in rivers or marine environments.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's continental crust, allowing it to survive numerous cycles of erosion.
Field identification & locations
Identified by its high hardness (scratches glass) and smooth, rounded water-worn shape. Commonly found in riverbeds, beaches, and conglomeratic sedimentary 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
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
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