sedimentary

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Dark brown to reddish; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Dark brown to reddish
Luster: Dull/Earthy

Identified April 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Dark brown to reddish; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; 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 over millions of years in river, desert, or marine environments. The dark color suggests iron oxide mineralization.

Uses & applications

Commonly used in construction for paving, building facades, and as an ornamental stone. Also used as a material for sharpening tools due to its abrasive texture.

Geological facts

Sandstone makes up about 10-25% of all sedimentary rocks found on Earth. It often stores vast reservoirs of groundwater, oil, and natural gas within its porous structure.

Field identification & locations

Identified by its gritty sandpaper-like feel. It is commonly found in sedimentary basins and cliffs. For collectors, it is often gathered for its unique textures or sedimentary structures like cross-bedding.