sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, red; Luster: Dull or earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; SG: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brown, yellow, red
Luster: Dull or earthy

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, red; Luster: Dull or earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; SG: 2.2-2.8

Formation & geological history

Formed from the accumulation and lithification of mineral particles or rock fragments, typically sand-sized grains of quartz or feldspar, in environments like deserts, riverbeds, or beaches.

Uses & applications

Widely used as a building material, paving stone, and decorative stone. Historically used for making grindstones and millstones. High porosity makes it a common reservoir for water and petroleum.

Geological facts

Sandstone makes up about 10-20% of Earth's sedimentary rocks. Famous structures like the Red Fort in India and many buildings in the US Southwest are made of it. It often preserves fossils and ripple marks from ancient environments.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins. Collectors should look for unique banding patterns like 'Liesegang rings' or fossil inclusions.