sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Hardness: 6-7 (Mohs scale); Color: Brown, reddish-tan, or grey due to iron oxides; Luster: Dull/Earthy; Structure: Clastic with visible sand-sized grains; Specific Gravity: 2.2-2.8.

Hardness: 6-7 (Mohs scale)
Color: Brown, reddish-tan, or grey due to iron oxides
Luster: Dull/Earthy

Identified March 21, 2026More sedimentary →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, reddish-tan, or grey due to iron oxides; Luster: Dull/Earthy; Structure: Clastic with visible sand-sized grains; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed by the accumulation of sand-sized mineral grains or rock fragments that are cemented together by minerals like silica or calcite over millions of years, typically in desert, river, or ocean environments.

Uses & applications

Commonly used in construction as a building stone or paving material, in the manufacturing of glass (if high silica content), and occasionally as a sharpening stone.

Geological facts

Sandstone formations like the Antelope Canyon in Arizona or Petra in Jordan are world-famous for their unique weathering patterns and historical architecture carved directly into the rock.

Field identification & locations

Identify in the field by its gritty 'sandpaper' texture and visible layering (bedding). It is found globally in sedimentary basins. Collectors often look for 'picture sandstone' with unique mineralization patterns.