sedimentary
Quartz Sand Grain
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear to light tan color, vitreous luster, trigonal crystal system, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, clear to light tan color, vitreous luster, trigonal crystal system, and conchoidal fracture.
Formation & geological history
Formed through the physical and chemical weathering of parent rocks like granite, followed by transport and deposition in sedimentary environments.
Uses & applications
Used extensively in glass manufacturing, construction aggregates, sandblasting, and electronics.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving multiple cycles of weathering.
Field identification & locations
Identified by its high hardness, resistance to acid, and lack of cleavage; found globally in beaches, deserts, and sandstones.
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Other sedimentary specimens
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