sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Tan, beige, or brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (granular fracture); Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, beige, or brown
Luster: Dull/Earthy

Identified June 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (granular fracture); Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in desert, river, or coastal environments.

Uses & applications

Extensively used in construction for paving and building, landscaping, and as a source for glass manufacturing (if high silica).

Geological facts

Sandstone is highly porous and often acts as a natural aquifer or a reservoir for oil and natural gas. Some sandstones contain fossils that help date the rock layers.

Field identification & locations

Identified by its gritty 'sandpaper' feel and visible grain texture. Found globally in canyon walls, cliffs, and desert outcrops. For collectors, check for layering (bedding).