sedimentary

Sandstone

Arenite (SiO2 based typically)

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, beige, or light brown
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clastic), typically sand-sized grains of quartz or feldspar. Often deposited in deserts, riverbeds, or beaches over millions of years.

Uses & applications

Used extensively in construction for paving and building facades, decorative landscaping, and as a reservoir rock for oil and natural gas in geology.

Geological facts

Sandstone is one of the most common types of sedimentary rock and provides critical information about the Earth's past environments, like ancient dunes or sea levels.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in terrestrial or marine sedimentary basins. Collectors often look for unique bedding patterns or fossils within.