sedimentary

Sedimentary Sandstone with Iron Oxide

Ferruginous Sandstone

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan due to iron oxide staining; Luster: Dull/Earthy; Texture: Granular and clastic; Cleavage: None; Structure: Massive or layered.

Hardness: 6-7 on Mohs scale
Color: Reddish-brown to tan due to iron oxide staining
Luster: Dull/Earthy

Identified July 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan due to iron oxide staining; Luster: Dull/Earthy; Texture: Granular and clastic; Cleavage: None; Structure: Massive or layered.

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains (usually quartz) by a mineral binder such as silica or calcium carbonate, with significant iron-rich minerals leaching into the matrix.

Uses & applications

Commonly used as a building material, in landscaping, and in the manufacturing of abrasives or glass if silica content is high.

Geological facts

The red color in sandstone is often a result of 'desert varnish' or hematite coating the individual sand grains; it is the primary rock type of many famous natural landmarks like the Grand Canyon.

Field identification & locations

Field identification involves checking for a gritty, sandpaper-like feel and the presence of visible grains. It can be found in sedimentary basins and riverbeds worldwide.