sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 (individual grains); Color: tan, brown, yellowish; Luster: dull to earthy; Texture: clastic, medium-grained (sand-sized); Cleavage: none; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: tan, brown, yellowish
Luster: dull to earthy

Identified July 17, 2026More sedimentary →

Explore Sandstone in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6-7 (individual grains); Color: tan, brown, yellowish; Luster: dull to earthy; Texture: clastic, medium-grained (sand-sized); Cleavage: none; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral particles or rock fragments. This specimen appears poorly lithified or friable, likely formed in a desert or riverbed environment during the Phanerozoic eon.

Uses & applications

Used in construction, as road base, for making glass (if high quartz content), and for decorative architectural features. Small fragments are primarily of interest to collectors or for educational purposes.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. Its porosity makes it a major reservoir for groundwater and petroleum.

Field identification & locations

Identified by its gritty feel like sandpaper and visible sand grains. Found in large basins and desert regions globally. Collectors should look for unique banding or fossil inclusions.