sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to milky color, vitreous to greasy luster, conchoidal fracture, and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white to milky color, vitreous to greasy luster, conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, rounding into smooth pebbles in river or beach environments.
Uses & applications
Used in landscaping, decorative gravel, and occasionally as a tumbling stone or abrasive material.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to both chemical and physical weathering.
Field identification & locations
Commonly found in stream beds, glacial tills, and beaches worldwide. Identify by its high hardness (scratches glass) and smooth, porcelain-like waterworn texture.
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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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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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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