sedimentary
Sandstone (Arkosic / Calcareous)
Arenite (primarily SiO2 with CaCO3/clay matrix)
AI-generated identification · may be incorrectHardness 6-7 (quartz grains) with softer matrix; tan/beige earthy luster with visible sub-angular to rounded quartz and feldspar grains.
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Physical properties
Hardness 6-7 (quartz grains) with softer matrix; tan/beige earthy luster with visible sub-angular to rounded quartz and feldspar grains.
Formation & geological history
Formed through the deposition, compaction, and cementation of mineral particles and rock fragments by silica, calcite, or iron oxides in shallow marine or desert environments.
Uses & applications
Commonly used in construction, paving, dimension stone, and as a natural reservoir rock for petroleum and groundwater.
Geological facts
Sandstone represents roughly 20-25% of all sedimentary rocks on Earth and is critical for mapping prehistoric environments.
Field identification & locations
Identified in the field by its distinctive gritty sandpaper feel and visible clastic grains; widespread in sedimentary basins globally.
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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