sedimentary
Sandstone
Sandstone (SiO2 dominated)
AI-generated identification · may be incorrectMohs hardness 6 to 7, earthy to dull luster, medium to fine-grained sand size particles, yellowish-brown to dark tan color due to iron oxide staining, granular feel similar to sandpaper
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Physical properties
Mohs hardness 6 to 7, earthy to dull luster, medium to fine-grained sand size particles, yellowish-brown to dark tan color due to iron oxide staining, granular feel similar to sandpaper
Formation & geological history
Formed by the compaction and cementation of sand-sized mineral particles or rock fragments, typically in desert, river, beach, or delta environments over millions of years
Uses & applications
Widely used as a construction material, flagstone, paving, decorative landscaping stone, and historically as a source of quartz for glassmaking
Geological facts
Sandstone represents about 10 to 20 percent of Earth's sedimentary rocks and often acts as a major aquifer for groundwater and reservoir for petroleum and natural gas
Field identification & locations
Identified by its distinctly gritty, sand-like texture when rubbed; commonly found along stream beds, cliff faces, deserts, and sedimentary rock formations 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)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary