sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide coating)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Reddish-brown to pink; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6
Color: Reddish-brown to pink
Luster: Dull/Earthy

Identified June 9, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Reddish-brown to pink; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river environments. The red color is due to the oxidation of iron minerals (hematite).

Uses & applications

Widely used as a building material, decorative stone in landscaping, and in the manufacturing of grindstones or glass if high in silica content.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous landmarks like the Grand Canyon and the red rocks of Sedona are composed primarily of these stones.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and coastal areas. Collectors value it for its layering and color variations.