sedimentary

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Dirty gray to brownish-tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None (conchoidal to irregular fracture), Specific Gravity: 2.2-2.8

Identified March 25, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Dirty gray to brownish-tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None (conchoidal to irregular fracture), Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears weathered and water-worn, likely from a fluvial (river) or coastal environment. Geological age varies widely by location but such rocks are common from the Paleozoic to Cenozoic eras.

Uses & applications

Primary use is in the construction industry as aggregate, road base, or building stone. High-quality varieties are used for glassmaking if quartz-rich. Common specimens have little jewelry value but are used as landscape accents.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. This specific piece shows significant rounding, suggesting it traveled a long distance in water before being deposited.

Field identification & locations

Identify in the field by its 'sandpaper' texture and the presence of visible grains. It can be scratched by a steel file but will scratch a copper penny. Found globally in basins, riverbeds, and deserts.