sedimentary

Sandstone

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

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

Hardness: 6-7 on Mohs scale
Color: Tan, brown, or yellow-brown
Luster: Dull/Earthy

Identified March 8, 2026More sedimentary →

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Physical properties

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

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Occurs in diverse environments like deserts, river deltas, and beaches over millions of years.

Uses & applications

Commonly used as a building material, paving stone, and decorative gravel. Historically used for making grindstones and lithographic plates.

Geological facts

Sandstone often preserves fossils and primary sedimentary structures like cross-bedding and ripple marks, providing clues to ancient Earth environments.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins. Collectors look for unique banding or fossil inclusions.