sedimentary

Sandstone (Calcareous or Quartz-rich)

Arenite

Hardness: 6-7 on Mohs scale (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: Approx 2.2 - 2.8

Hardness: 6-7 on Mohs scale (if quartz-rich)
Color: Tan, beige, or light brown
Luster: Dull/Earthy

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale (if quartz-rich); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: Approx 2.2 - 2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in river, lake, or desert environments during various geological eras.

Uses & applications

Commonly used in construction for paving, building facades, and as an aggregate in concrete. Often used in landscaping as decorative stone.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are primarily sandstone.

Field identification & locations

Identify in the field by its gritty, sand-paper-like texture. It is found globally in sedimentary basins. Collectors often look for colorful banding (Liesegang rings) or fossil inclusions.