sedimentary

Sandstone

Arenite (clastic sedimentary rock)

Hardness: 6-7 (individual grains); Color: tan, buff, beige with reddish speckles; Luster: dull to earthy; Texture: clastic/granular (sand-sized grains); Cleavage: none.

Hardness: 6-7 (individual grains)
Color: tan, buff, beige with reddish speckles
Luster: dull to earthy

Identified July 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: tan, buff, beige with reddish speckles; Luster: dull to earthy; Texture: clastic/granular (sand-sized grains); Cleavage: none.

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through lithification in river beds, deserts, or marine environments. Some specimens date back hundreds of millions of years.

Uses & applications

Widely used as a building material, road base, for making grindstones, and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. The red and gold colors often seen are due to iron oxide (hematite) or limonite impurities.

Field identification & locations

Identify by its gritty feel (like sandpaper) and visible grains. Found globally in canyon walls, plateaus, and coastal cliffs. Collectors look for specific patterns like cross-bedding.