sedimentary

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: tan, yellow, or buff; Luster: matte/dull; Structure: clastic texture with visible sand-sized grains; Cleavage: none; Specific Gravity: 2.2-2.8.

Hardness: 6-7 on Mohs scale
Color: tan, yellow, or buff
Luster: matte/dull

Identified March 23, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: tan, yellow, or buff; Luster: matte/dull; Structure: clastic texture with visible sand-sized grains; Cleavage: none; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments, typically sand. Most commonly formed in ancient river beds, beaches, or desert environments over millions of years (dates vary by specific location).

Uses & applications

Extensively used in construction as a building material, decorative stone for landscaping, and in the production of glass (if high quartz purity). It is also a significant reservoir rock for oil and groundwater.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. The famous red rock formations of the American Southwest and the ancient city of Petra are both primarily composed of sandstone.

Field identification & locations

Identify in the field by its 'gritty' feel (like sandpaper) and visible bedding layers. It is found globally in sedimentary basins. Collectors often look for examples with interesting fossil inclusions or 'desert rose' formations.