sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: reddish-brown to orange from iron oxide; Luster: dull/earthy; Crystal structure: clastic/granular texture; Cleavage: none; Specific gravity: approx. 2.0-2.6

Hardness: 6-7 (Mohs scale)
Color: reddish-brown to orange from iron oxide
Luster: dull/earthy

Identified June 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: reddish-brown to orange from iron oxide; Luster: dull/earthy; Crystal structure: clastic/granular texture; Cleavage: none; Specific gravity: approx. 2.0-2.6

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The reddish hue indicates oxidation of iron-bearing minerals during deposition in terrestrial or shallow marine environments.

Uses & applications

Used in construction as a building stone and paving material; common in landscaping; sometimes used as an abrasive in industrial glass-making.

Geological facts

Sandstone accounts for roughly 20 percent of all sedimentary rocks on Earth and is famous for forming the spectacular canyons of the American Southwest.

Field identification & locations

Identify by its gritty, sand-like texture when rubbed and its visible layered or blocky appearance. Often found in riverbeds, desert dunes, and sedimentary basins. Rub against a rough surface to check for grain shedding.