sedimentary
Sandstone
Arenite (SiO2 principal component)
Hardness: 6-7 (Mohs); Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Clastic texture; Specific gravity: 2.2–2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, or grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Clastic texture; Specific gravity: 2.2–2.8
Formation & geological history
Formed over millions of years by the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or marine environments.
Uses & applications
Used extensively in construction as a building material, in the glass industry as a source of silica, and as a decorative stone in landscaping.
Geological facts
Sandstone can contain fossils and provides vital clues about prehistoric environments; it is often the primary reservoir rock for oil and natural gas.
Field identification & locations
Identified by its gritty feel like sandpaper and visible grains; commonly found in varied geological strata including canyons and riverbanks.
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Shale
Shale (clastic sedimentary rock)
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Brown Sandstone (River Rock)
Arenite
sedimentary
Shale
Argillaceous sedimentary rock
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Mudstone
Argillite / Siliciclastic sedimentary rock
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