Sedimentary
Sandstone or Siltstone
Arenite (if sandstone)
Hardness: 6-7 (depends on cement); Color: Tan, brown, grey; Luster: Dull/Earth; Structure: Clastic, gritty texture
- Hardness
- 6-7 (depends on cement)
- Color
- Tan, brown, grey
- Luster
- Dull/Earth
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Physical properties
Hardness: 6-7 (depends on cement); Color: Tan, brown, grey; Luster: Dull/Earth; Structure: Clastic, gritty texture
Formation & geological history
Formed from the compaction and cementation of sand-sized grains over millions of years, typically in river, desert, or shallow marine environments.
Uses & applications
Used in construction, as aggregate, and sometimes for landscaping or facing stone.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is found in sedimentary basins worldwide.
Field identification & locations
Identified by its gritty feel, visible sand grains, and layering (bedding). Commonly found exposed in cliffs, riverbeds, and arid regions. Collectors might look for specimens with interesting banding or fossils.
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