sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to off-white color, vitreous to greasy luster, trigonal crystal system, and no cleavage with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to off-white color, vitreous to greasy luster, trigonal crystal system, and no cleavage with conchoidal fracture.
Formation & geological history
Formed through intense weathering and aqueous transport of primary igneous or metamorphic rocks, typically accumulating in riverbeds and beaches over millions of years.
Uses & applications
Used in landscaping, decorative stone, abrasive manufacturing, and as tumbled stones for lapidary crafts.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's continental crust, allowing it to survive immense mechanical weathering.
Field identification & locations
Easily identified in the field by its high hardness which easily scratches glass and its lack of reaction to hydrochloric acid. Found globally in alluvial deposits.
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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
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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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