sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3/FeO(OH) cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains), Color: Ochre to brownish-orange, Luster: Dull/Earthy, Grainy texture like sandpaper, Porous structure

Luster: Dull/Earthy, Grainy texture like sandpaper, Porous structure

Identified July 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains), Color: Ochre to brownish-orange, Luster: Dull/Earthy, Grainy texture like sandpaper, Porous structure

Formation & geological history

Formed by the accumulation and cementation of sand-sized grains, primarily quartz. The orange-brown color indicates the presence of iron oxide (hematite or limonite) acting as a cementing agent. Usually found in desert, river, or ocean environments.

Uses & applications

Used in construction, as a building stone, in road base, and occasionally for glass making if high in quartz silica content. Commonly collected as a representative sedimentary specimen.

Geological facts

Iron-stained sandstone is responsible for some of the world's most famous geological landmarks, including the 'Red Rocks' of the American Southwest. It can preserve footprints and ripple marks from ancient environments.

Field identification & locations

Identify by its gritty texture and visible sand grains. It will feel abrasive to the touch. Common in sedimentary basins worldwide. When scratched, it may release individual grains of sand.