sedimentary

Sandstone

Arenite (SiO2 principal component)

Hardness: 6.5-7 Mohs; Color: Tan, beige, or yellowish-brown; Luster: Dull to earthy; Texture: Granular, sandpaper-like feel; Cleavage: None (breaks across grains); Porous structure.

Hardness: 6
Color: Tan, beige, or yellowish-brown
Luster: Dull to earthy

Identified July 11, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Tan, beige, or yellowish-brown; Luster: Dull to earthy; Texture: Granular, sandpaper-like feel; Cleavage: None (breaks across grains); Porous structure.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or marine environments. This specimen appears to be a water-worn river cobble.

Uses & applications

Commonly used as a building material, in glass manufacturing (if high silica), and as a sharpening stone or abrasive. Tumbled versions are used in landscaping.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. Its porosity makes it a critical reservoir for groundwater and petroleum. Some sandstones are resistant enough to preserve ancient footprints or fossils.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering (bedding). Found worldwide in basins and coastal regions. Avoid using acid tests as they may react with calcite cement but not the grains themselves.