sedimentary

Sandstone

Arenite (SiO2 based clastic rock)

Mohs hardness: 6 to 7; Color: Tan, brown, gray; Luster: Dull/Earthy; Texture: Granular, abrasive feel like sandpaper; Composition: Primarily quartz and feldspar grains.

Hardness: 6 to 7
Color: Tan, brown, gray
Luster: Dull/Earthy

Identified July 1, 2026More sedimentary →

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Physical properties

Mohs hardness: 6 to 7; Color: Tan, brown, gray; Luster: Dull/Earthy; Texture: Granular, abrasive feel like sandpaper; Composition: Primarily quartz and feldspar grains.

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments in river beds, deserts, or coastal environments. Often dates from the Paleozoic to Mesozoic eras.

Uses & applications

Widely used in construction for building stone, paving, and decorative landscaping. High-quality quartz sandstones are used for glass manufacturing and abrasive tools.

Geological facts

Sandstone is highly porous and acts as a natural filter; it is one of the most common reservoir rocks for groundwater, petroleum, and natural gas.

Field identification & locations

Identify in the field by its gritty texture and visible bedding planes. Common in arid environments or near ancient waterway basins. It won't fizz with acid unless it has a calcitic cement.