sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Hardness: 6-7 Mohs; Color: Tan, brown, ochre, or grey; Luster: Dull/Earthy; Structure: Granular with visible bedding planes/layering; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, brown, ochre, or grey
Luster: Dull/Earthy

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, ochre, or grey; Luster: Dull/Earthy; Structure: Granular with visible bedding planes/layering; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in river beds, beaches, or desert environments. This specimen shows water-worn rounding and distinct layering (bedding).

Uses & applications

Commonly used as a building material, in road construction as aggregate, and for grindstones or filtering systems. It is also an important reservoir rock for oil and groundwater.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks in Earth's crust. It often preserves fossils and ripple marks from ancient riverbeds or dunes.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is found globally in sedimentary basins. For collectors, look for unique patterns or fossils.