sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8; Feel: Gritty like sandpaper.

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

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8; Feel: Gritty like sandpaper.

Formation & geological history

Formed over millions of years by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically quartz or feldspar, in environments like deserts, river beds, or beaches.

Uses & applications

Used extensively in construction as a building stone, for paving, in the manufacture of glass, and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone is one of the most common types of sedimentary rock and often preserves ripple marks or cross-bedding from ancient water currents or winds.

Field identification & locations

Identify by its gritty texture and visible sand grains. Common in the Western US, Sahara, and many mountain ranges. Collectors look for unique banding or fossil inclusions.