sedimentary

Sandstone

Sandstone (SiO2 dominated)

Hardness: 6-7 on Mohs scale, Color: tan to light yellowish-brown, Luster: dull to earthy, Texture: medium-grained clastic with gritty feel, Cleavage: none, Specific Gravity: 2.2-2.8

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale, Color: tan to light yellowish-brown, Luster: dull to earthy, Texture: medium-grained clastic with gritty feel, Cleavage: none, Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the compaction and cementation of sand-sized mineral particles or rock fragments, typically composed of quartz and feldspar, deposited in desert, river, or coastal environments over millions of years.

Uses & applications

Widely used as a construction material, building stone, paving, flagstone, and ornamental stone due to its durability and ease of carving.

Geological facts

Sandstone formations account for many famous natural landmarks around the world, such as the Red Rocks of Colorado, Petra in Jordan, and Antelope Canyon in Arizona.

Field identification & locations

Identified in the field by its characteristic grainy, sand-like texture that feels like sandpaper to the touch. Commonly found in sedimentary basins, canyon walls, and riverbeds worldwide.