sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Hardness: 6.5-7 (Mohs scale); Color: Red, maroon, brownish-pink; Luster: Dull/Earthy; Structure: Clastic, granular texture; Specific Gravity: 2.2-2.8.

Hardness: 6
Color: Red, maroon, brownish-pink
Luster: Dull/Earthy

Identified June 25, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Red, maroon, brownish-pink; Luster: Dull/Earthy; Structure: Clastic, granular texture; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral grains, primarily quartz and feldspar, in desert or river environments. Red color is due to iron oxide (hematite) staining. Common in formations like the Old Red Sandstone (Devonian age).

Uses & applications

Used in construction, architecture, landscaping, and historically for grinding stones or monuments. Small beach pebbles are often used in decorative garden features.

Geological facts

The red color is a result of the oxidation of iron-bearing minerals, earning it the nickname 'redbeds.' It is the primary rock type of many famous natural landmarks like the Grand Canyon.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and distinct red/brown hue that doesn't wash off. Commonly found in riverbeds, coastal areas, and desert outcrops. Not a rare collector's item but valued for historical context.