sedimentary
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
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
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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.
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