sedimentary

Sandstone (Quartz-rich)

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, brownish-grey; Luster: Dull or earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brownish-grey
Luster: Dull or earthy

Identified May 30, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brownish-grey; Luster: Dull or earthy; Crystal structure: Clastic (granular); 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, typically in river beds, deserts, or marine environments over millions of years.

Uses & applications

Commonly used in construction as a building material, road base, or for decorative landscaping. Historically used for grindstones and early architecture.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rock formations in Utah and Arizona are composed mostly of sandstone.

Field identification & locations

Identify by its gritty texture (feels like sandpaper). Often found in areas with ancient riverbeds or coastal history. Look for layering or bedding planes.