sedimentary

Sandstone

Arenite (often composed of Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, or buff
Luster: Dull/Earthy

Identified May 7, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Typically deposited in desert, river, or coastal environments over millions of years (various geological ages from Precambrian to recent).

Uses & applications

Widely used as a construction material (building stone), as an abrasive (grindstones), and as a reservoir rock for oil, gas, and groundwater.

Geological facts

Sandstone makes up about 10-25% of the sedimentary rocks on Earth. Famous landmarks like the Grand Canyon exhibit massive layers of various sandstones.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. It is commonly found in sedimentary basins and arid regions. Collectors look for unique banding (like 'Wonderstone') or fossils embedded within.