sedimentary

Sandstone (likely Graywacke or Lithic Arenite)

Clastic sedimentary rock predominantly composed of silicate grains

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Grayish-tan, beige; Luster: Dull, earthy; Structure: Granular/clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Grayish-tan, beige
Luster: Dull, earthy

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Grayish-tan, beige; Luster: Dull, earthy; Structure: Granular/clastic; 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 (clasts) in marine or fluvial environments. Deposits are often millions of years old, dating from various geological eras.

Uses & applications

Used primarily as construction aggregate, building stone, and in some cases, for landscaping or paving. Finer specimens are used for research into sedimentary basin history.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. This specific piece shows a flattened, water-worn or weathered shape, possibly suggesting transport in a river or marine environment.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. It is extremely common globally, found in ancient coastal areas or riverbeds. Collectors look for unique banding or fossil inclusions.