sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Hardness: 6-7 (Mohs scale); Color: tan, brown, yellow, red; Luster: dull to earthy; Structure: granular/clastic; Cleavage: none; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: tan, brown, yellow, red
Luster: dull to earthy

Identified March 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: tan, brown, yellow, red; Luster: dull to earthy; Structure: granular/clastic; Cleavage: none; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of mineral particles or rock fragments, typically sand-sized grains of quartz or feldspar. Often deposited in deserts, riverbeds, or coastal environments over millions of years.

Uses & applications

Widely used as a construction material (dimension stone), in glass manufacturing (if high silica content), as a reservoir rock for oil/gas, and for decorative garden landscaping.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous landmarks like the Grand Canyon or the Treasury at Petra are carved into sandstone formations.

Field identification & locations

Identify by its gritty, 'sandpaper' texture and visible grain layers. Common in regions with ancient basins or coastal history. For collectors, look for cross-bedding or unique color banding like 'Wonderstone'.