sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz grains)
AI-generated identification · may be incorrectHardness 6-7, typically brown, tan, or reddish, dull luster, granular structure, specific gravity around 2.2-2.8.
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Physical properties
Hardness 6-7, typically brown, tan, or reddish, dull luster, granular structure, specific gravity around 2.2-2.8.
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, often in desert or beach environments over millions of years.
Uses & applications
Commonly used in construction, paving, as dimension stone, and in manufacturing glass.
Geological facts
Sandstone formations like Zion National Park display stunning cross-bedding created by ancient wind or water currents.
Field identification & locations
Identify in the field by its visible sand-grain texture and gritty feel. Found worldwide in sedimentary basins.
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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