sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Brown, tan, or reddish-brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Brown, tan, or reddish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brown, tan, or reddish-brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or deserts.
Uses & applications
Used widely in construction and masonry, as a decorative building stone, and historically as grindstones for sharpeners.
Geological facts
Sandstone often preserves fossils and ripple marks from ancient water currents, providing a 'snapshot' of Earth's ancient environments.
Field identification & locations
Identify by its gritty, sandpaper-like texture. It common in areas with exposed sedimentary basins. For collectors, look for unique colors or fossil inclusions.
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