sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically grey, white, or translucent colors.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically grey, white, or translucent colors.
Formation & geological history
Formed through mechanical weathering and water transportation of parent quartz veins or pegmatites, resulting in smooth, rounded pebble shapes.
Uses & applications
Used in landscaping, decorative stone, and sometimes as a raw material in aggregate or glass manufacturing.
Geological facts
Quartz is one of the most abundant minerals on Earth and exhibits piezoelectric properties, meaning it generates an electrical charge under mechanical stress.
Field identification & locations
Easily identified by its high hardness (scratches glass) and resistance to weathering, commonly found in riverbeds, beaches, and alluvial deposits worldwide.
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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