sedimentary

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish due to iron oxide staining; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brown, tan, reddish due to iron oxide staining
Luster: Dull/Earthy

Identified March 31, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish due to iron oxide staining; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains (lithification). These typically deposit in riverbeds, deserts, or marine environments. Age varies based on deposit, ranging from millions to billions of years old.

Uses & applications

Commonly used as a building material, decorative stone, for making grindstones, and as a source of high-purity silica for glass manufacturing.

Geological facts

Sandstone can preserve fossil remains and ripple marks from ancient water bodies. Its porosity makes it a critical reservoir for groundwater, oil, and natural gas in many geological basins.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible grains. It is extremely common globally, found in extensive formations like the Colorado Plateau. For collectors, look for unique patterns like 'wonderstone' or fossil inclusions.