sedimentary
Quartz Sand Grain
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, typically colorless or pale brown, vitreous luster, trigonal crystal system, no true cleavage.
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Physical properties
Mohs hardness of 7, typically colorless or pale brown, vitreous luster, trigonal crystal system, no true cleavage.
Formation & geological history
Formed through the mechanical weathering and breakdown of parent igneous or metamorphic rocks, often transported by wind or water.
Uses & applications
Used in educational geology kits, glass manufacturing, and abrasive materials.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Identified by its high hardness, scratch resistance, and lack of reaction to acid. Commonly found in sedimentary basins and beaches worldwide.
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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
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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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