sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, pink to translucent white color, vitreous luster, hexagonal crystal system when unweathered, and conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 7 on Mohs scale, pink to translucent white color, vitreous luster, hexagonal crystal system when unweathered, and conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, rounding rough edges in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative ground cover, historical stone tools, and occasionally tumbled for lapidary crafts or tumbling stones.
Geological facts
Quartz is one of the most durable and abundant minerals on Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Easily identified by its resistance to scratching by steel and smooth, rounded water-worn shape; found universally in stream beds, beaches, and gravel bars.
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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