sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
Hardness of 6-7 on the Mohs scale, typically brown, tan, yellow, or red in color, dull to earthy luster, granular texture composed mostly of quartz and feldspar grains.
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Physical properties
Hardness of 6-7 on the Mohs scale, typically brown, tan, yellow, or red in color, dull to earthy luster, granular texture composed mostly of quartz and feldspar grains.
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, in marine, lake, or desert environments over millions of years.
Uses & applications
Commonly used in construction, building facades, paving stones, and as a natural grindstone.
Geological facts
Sandstone formations often preserve ancient ripple marks, fossilized footprints, and desert dune cross-bedding, providing geologists with clues about prehistoric environments.
Field identification & locations
Easily identified by its gritty, sandpaper-like texture and visible mineral grains. It is found worldwide in sedimentary basins and arid or coastal regions.
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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