sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, beige, or grey with subtle bedding planes; Luster: Dull/Earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: approx. 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, beige, or grey with subtle bedding planes
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or grey with subtle bedding planes; Luster: Dull/Earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: approx. 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles (lithification) or rock fragments. Often formed in ancient river beds, beaches, or desert environments where sand is deposited and buried over millions of years.

Uses & applications

Widely used in the construction of buildings and monuments due to its durability. High-purity sandstones are used in glass manufacturing and as industrial abrasives.

Geological facts

Sandstone is one of the most common types of sedimentary rock and provides critical information about the Earth\'s geological history, often containing fossils and evidence of ancient environmental conditions.

Field identification & locations

Identify in the field by its gritty, abrasive texture (like sandpaper) and visible layering (bedding planes). It is common in regions with large sedimentary basins such as the Southwestern United States or the Grand Canyon.