sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white or translucent color, vitreous luster, hexagonal crystal system when unweathered, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white or translucent color, vitreous luster, hexagonal crystal system when unweathered, and conchoidal fracture.
Formation & geological history
Formed through the accumulation and mechanical weathering of durable quartz grains eroded from parent igneous or metamorphic rocks over millions of years.
Uses & applications
Used in landscaping, decorative ground cover, abrasive manufacturing, and as tumbled stones for lapidary arts.
Geological facts
Quartz is one of the most abundant and weathering-resistant minerals in Earth's continental crust, often outlasting all other minerals in sedimentary cycles.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape found abundantly in riverbeds and beaches.
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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
fossil
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