sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
Hardness: 6-7 (individual grains); Color: Reddish-brown, tan; Luster: Dull, earthy; Crystal structure: Clastic (granular); Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Reddish-brown, tan
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Reddish-brown, tan; Luster: Dull, earthy; Crystal structure: Clastic (granular); Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The reddish hue indicates the presence of iron oxide (hematite) during the lithification process.
Uses & applications
Used primarily in building construction as dimension stone, paving, and occasionally for sharpening tools in primitive contexts.
Geological facts
Sandstone accounts for about 10-20% of the Earth's sedimentary rocks. It is a major aquifer for groundwater and a common reservoir for petroleum.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering or bedding planes. This specimen appears water-worn, suggesting it was found near a river or coastal environment.
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