sedimentary
Sandstone
Arenite
Hardness: 6-7 (Mohs), Color: tan/brown/yellow, Luster: dull/earthy, Structure: clastic/granular texture with visible sand grains, Cleavage: none.
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Physical properties
Hardness: 6-7 (Mohs), Color: tan/brown/yellow, Luster: dull/earthy, Structure: clastic/granular texture with visible sand grains, Cleavage: none.
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically through pressure and mineral cements like silica or calcium carbonate in river, sea, or desert environments.
Uses & applications
Used widely in construction for paving, building stone, and tiles; also used as a reservoir rock for oil and gas.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is often responsible for the spectacular formations seen in the American Southwest, such as the Grand Canyon and Antelope Canyon.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layers or bedding. Commonly found in coastal areas, river beds, and cliffs. Easily scratched with quartz but and leaves a grainy residue.
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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary