sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, white to yellowish-brown color, vitreous luster, conchoidal fracture, and specific gravity around 2.65.
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Physical properties
Mohs hardness of 7, white to yellowish-brown color, vitreous luster, conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of quartz veins or parent rock, smoothing into a rounded pebble over millions of years.
Uses & applications
Commonly used in landscaping, decorative aggregates, and as a natural specimen for rock tumbling and casual collecting.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape. Found worldwide in riverbeds, beaches, and alluvial deposits.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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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)
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