sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Cream, tan, or white with reddish undertones; Luster: Dull to earthy; Structure: Granular, clastic texture; Cleavage: None, breaks across grains; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Cream, tan, or white with reddish undertones
Luster: Dull to earthy

Identified May 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation of sand-sized mineral particles (usually quartz or feldspar) in environments like deserts, river beds, or beaches. Over millions of years, pressure and minerals like silica or calcium carbonate cement the grains together.

Uses & applications

Widely used in the construction of buildings, monuments, and paving. Historically significant for stone masonry and sculpture. Crushed sandstone is also used as an aggregate.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. It often contains fossils and serves as a primary reservoir for underground water (aquifers) and oil/gas deposits due to its porosity.

Field identification & locations

Identify in the field by its gritty, sand-like texture that feels like sandpaper. It is found globally, notably in the Southwestern United States (Grand Canyon). Collectors look for unique layering (cross-bedding) or fossils.