sedimentary

Sandstone

Arenite (Sandstone)

Hardness: 6-7 Mohs; Color: Brown, gray, tan; Luster: Dull/Earthy; Crystal structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Brown, gray, tan
Luster: Dull/Earthy

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brown, gray, tan; Luster: Dull/Earthy; Crystal structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral grains, primarily quartz and feldspar, often in riverbeds, deserts, or coastal environments. This specimen shows river-worn rounding.

Uses & applications

Commonly used as a building material, in glass manufacturing (if high silica), and for road aggregate.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. It often contains fossils and acts as a major reservoir for groundwater and petroleum.

Field identification & locations

Identified by its sandpaper-like gritty texture. Commonly found in riverbeds, canyons, and sedimentary basins. It will usually scratch glass if it is quartz-rich.