sedimentary
Quartz Sand Grain
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear to pale brown color, vitreous luster, hexagonal crystal system when well-formed, and conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, clear to pale brown color, vitreous luster, hexagonal crystal system when well-formed, and conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the mechanical and chemical weathering of parent rocks like granite, accumulating in sedimentary environments like beaches and deserts over millions of years.
Uses & applications
Used in glass manufacturing, construction aggregates, electronics, and foundational geological studies of sediment transport.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's surface, resisting chemical weathering longer than almost any other mineral.
Field identification & locations
Identified by its high hardness, lack of cleavage, and resistance to acid; commonly found in sandstone formations and loose surface soils.
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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
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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