sedimentary

Sandstone (Red Sandstone)

Arenite (primarily Quartz with Hematite cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Reddish-brown to tan, Luster: Dull or earthy, Crystal structure: Clastic (granular texture), Cleavage: None, Specific gravity: 2.2-2.8

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Reddish-brown to tan, Luster: Dull or earthy, Crystal structure: Clastic (granular texture), Cleavage: None, Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in high-energy environments like deserts, river deltas, or beaches. The red color suggests deposition in an oxygen-rich terrestrial environment where iron oxides (hematite) coated the grains.

Uses & applications

Commonly used as a building material, paving stone, and in the manufacturing of glass. Also used for grindstones and in landscaping.

Geological facts

Famous structures built with red sandstone include the city of Petra in Jordan and many iconic American Southwest landmarks like the monuments in Sedona, Arizona.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible sand grains. It is commonly found in basins or arid regions where ancient sedimentary layers are exposed.