sedimentary
Sandstone
Arenite (SiO2 primarily)
AI-generated identification · may be incorrectMohs hardness: 6-7; Color: Tan, brown, or buff; Luster: Dull/Earthy; Texture: Granular (sand-like grains); Structure: Clastic; Cleavage: None
- Hardness
- 6-7
- Color
- Tan, brown, or buff
- Luster
- Dull/Earthy
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Physical properties
Mohs hardness: 6-7; Color: Tan, brown, or buff; Luster: Dull/Earthy; Texture: Granular (sand-like grains); Structure: Clastic; Cleavage: None
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years in deserts, riverbeds, or ocean basins.
Uses & applications
Widely used as a construction material for buildings and paving, as a source for glass manufacturing (silica), and as an aquifer for water storage.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient riverbeds or sea floors, providing a snapshot of the geologic past.
Field identification & locations
Identify by its gritty, sand-like texture when touched. Common in sedimentary basins worldwide. Durable but easily carved for masonry.
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Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary