sedimentary
Sandstone
Arenite
Mohs hardness around 6-7 (depends on cement), typically tan, brown, yellow, red, grey, or white. Dull or earthy luster. Composed of sand-sized grains (mostly quartz or feldspar) cemented together. Rough, granular texture.
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Physical properties
Mohs hardness around 6-7 (depends on cement), typically tan, brown, yellow, red, grey, or white. Dull or earthy luster. Composed of sand-sized grains (mostly quartz or feldspar) cemented together. Rough, granular texture.
Formation & geological history
Formed by the compaction and cementation of sand grains over time. Often deposited in desert, river, or coastal environments. Can be of various geological ages.
Uses & applications
Widely used in construction, paving, and architectural facing. Historically used for making grindstones. Some porous sandstones act as aquifers or petroleum reservoirs.
Geological facts
The color of sandstone often depends on the cementing material (e.g., iron oxide creates red/brown sandstone). Famous rock formations like those in Zion National Park or Petra are made of sandstone.
Field identification & locations
Identified by its sandy, granular texture that feels like sandpaper. Grains are visible to the naked eye. Common worldwide in sedimentary basins. Collectors often seek pieces with interesting banding or fossils.
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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary