sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown to tan color, waxy to vitreous luster, trigonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, brown to tan color, waxy to vitreous luster, trigonal crystal system, conchoidal fracture.
Formation & geological history
Formed through mechanical weathering and aqueous transport of preexisting quartz-bearing rocks over extended geological timescales.
Uses & applications
Commonly used in landscaping, decorative aggregates, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's surface, highly resistant to both chemical and physical weathering.
Field identification & locations
Found worldwide in stream beds, beaches, and alluvial deposits; identified by its high hardness and smooth, water-worn shape.
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Other sedimentary specimens
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
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary