Sandstone (Ferruginous)

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.

Identified on: 4/15/2026

Mode: Standard