sedimentary

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, brown, or grayish; Luster: Dull or earthy; Crystal structure: Granular/clastic texture (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, or grayish
Luster: Dull or earthy

Identified March 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, or grayish; Luster: Dull or earthy; Crystal structure: Granular/clastic texture (sand grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains (usually quartz or feldspar) over millions of years. This specimen shows signs of water-worn weathering, likely from a riverbed or coastal environment.

Uses & applications

Commonly used as a building material, in the manufacture of glass (if high quartz content), for grindstones, and as a reservoir rock in the petroleum industry.

Geological facts

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. The famous 'Ancient City of Petra' in Jordan is carved entirely out of sandstone cliffs.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering (faint in this specimen due to rounding). Often found in desert basins, riverbeds, and along shorelines.