sedimentary

Sandstone

Sandstone (SiO2 dominant)

Hardness: 6-7 (varies based on cementation). Color: Light tan, grey, yellowish-brown. Luster: Earthy to dull. Texture: Medium-grained, gritty sand-like feel with micro-granular surface.

Hardness: 6-7 (varies based on cementation)
Color: Light tan, grey, yellowish-brown
Luster: Earthy to dull

Identified July 24, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (varies based on cementation). Color: Light tan, grey, yellowish-brown. Luster: Earthy to dull. Texture: Medium-grained, gritty sand-like feel with micro-granular surface.

Formation & geological history

Formed from the accumulation, compaction, and cementation of sand-sized mineral particles (mostly quartz and feldspar) in river, beach, or desert sand dune environments.

Uses & applications

Widely used as a construction material, flagstone, paving stone, decorative landscaping stone, and in glass manufacturing.

Geological facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. Its high porosity makes it a key reservoir rock for groundwater and petroleum.

Field identification & locations

Identified in the field by its distinctive grainy, sandpaper-like surface feel and visible rounded or angular sand grains. Commonly found in canyon walls, river beds, and coastal bluffs.