sedimentary

Red Sandstone

Arenite (Hematitic / Ferruginous Sandstone)

Hardness: 6-7 on Mohs scale (due to quartz grains); Color: reddish-brown to brick red from iron oxide (hematite); Luster: dull to earthy; Texture: medium-grained, feel like sandpaper; Specific Gravity: approximately 2.2-2.8.

Hardness: 6-7 on Mohs scale (due to quartz grains)
Color: reddish-brown to brick red from iron oxide (hematite)
Luster: dull to earthy

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the accumulation and cementation of sand-sized grains, predominantly quartz, in desert, fluvial, or shallow marine environments. The reddish color is due to iron oxide staining during lithification.

Uses & applications

Widely used as a construction and building material, flagstone for paving, landscaping, decorative rock, and historically in stone masonry and sculpting.

Geological facts

Red sandstone formations create some of the world's most iconic landscapes, such as the Red Rocks in Colorado, Zion National Park, and the ancient city of Petra in Jordan.

Field identification & locations

Identified in the field by its distinct gritty sandpaper texture and warm red-orange iron oxide color. Commonly found in ancient basin sediments, desert dunes, and river deposits worldwide.

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Arenite (if sandstone)

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