sedimentary

Red Sandstone (with possible iron oxide staining)

Sandstone (primarily Quartz with Hematite/Goethite cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Red, reddish-brown, earthy, Luster: Dull to earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Identified May 30, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Red, reddish-brown, earthy, Luster: Dull to earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color suggests deposition in an oxidizing environment (terrestrial) where iron minerals rusted to form hematite cement.

Uses & applications

Construction (building stone), landscaping, glass manufacturing, and as a reservoir rock for petroleum or groundwater.

Geological facts

Red sandstones are famous for forming dramatic landscapes like the Grand Canyon and the 'Red Rocks' of Sedona. They often preserve ripples and footprints from prehistoric environments.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Look for layering or bedding planes. Common in arid or semi-arid geological basins.