sedimentary
Sandstone
Arenite (primarily SiO2)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: tan/light gray, Luster: dull/earthy, Structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/light gray, Luster: dull/earthy, Structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Widely used in the construction industry as building stone and decorative paving. Also used as a reservoir rock for oil and natural gas.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous examples include the red rock formations in Sedona, Arizona and Petra in Jordan.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible bedding planes. Commonly found in riverbeds, beaches, and canyons. Collectors value specimens with unique weathering or rhythmic banding.
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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