sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, white, or light gray; Luster: Dull/Earthy; Structure: Clastic with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, white, or light gray
Luster: Dull/Earthy

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, white, or light gray; Luster: Dull/Earthy; Structure: Clastic with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) in marine or desert environments over millions of years.

Uses & applications

Commonly used as a building material, in paving, for making grindstones, and as a source of silica for glass manufacturing.

Geological facts

Sandstone is often very porous and acts as a natural filter for groundwater and a reservoir for oil and natural gas. Some layers preserve spectacular fossils and ripple marks from ancient seas.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible layering (bedding). It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.