sedimentary

Red Sandstone

Sandstone with Hematite cement

AI-generated identification · may be incorrect

Hardness: 6-7 (quartz sand grains); Color: Red/rust due to iron oxide; Luster: Earthy to dull; Texture: Clastic, gritty feel.

Hardness: 6-7 (quartz sand grains)
Color: Red/rust due to iron oxide
Luster: Earthy to dull

Identified August 25, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (quartz sand grains); Color: Red/rust due to iron oxide; Luster: Earthy to dull; Texture: Clastic, gritty feel.

Formation & geological history

Formed by the accumulation and lithification of sand-sized grains, typically in ancient desert, river, or coastal environments. The red color comes from iron oxide (hematite) cementing the grains together over millions of years.

Uses & applications

Commonly used in construction as a building material, dimension stone, and for decorative landscaping.

Geological facts

Red sandstone was widely used in ancient architecture, including iconic structures like Petra in Jordan and many castles and cathedrals in Europe and India.

Field identification & locations

Identified by its gritty feel (like sandpaper) and distinct red color. Commonly found worldwide in sedimentary basins. A simple streak test on unglazed porcelain will often leave a reddish-brown streak due to the hematite.