sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

AI-generated identification · may be incorrect

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

Identified April 15, 2026More sedimentary →

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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.