sedimentary

Red Sandstone

Arenite (Iron-rich Sandstone)

Hardness: 6-7 (Mohs scale); Color: Brick red to brownish-orange; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of cemented sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brick red to brownish-orange
Luster: Dull/Earthy

Identified July 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brick red to brownish-orange; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of cemented sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains of mineral, rock, or organic material. The red color indicates the presence of iron oxides (hematite) and typically suggests formation in arid, terrestrial environments like deserts or river floodplains.

Uses & applications

Widely used as a construction material (building stone), as an abrasive in industry, and occasionally as a source of iron or industrial sand. Native cultures have used it throughout history for tools and carvings.

Geological facts

The red sandstone formations of the American Southwest, such as those in the Grand Canyon or Arches National Park, are iconic examples of this rock. It is often referred to as 'redbed' in stratigraphic geology.

Field identification & locations

Identify by its gritty texture (like sandpaper) and its distinct red-orange streak. It is commonly found in vast layers in sedimentary basins worldwide. Collectors should look for unique cross-bedding patterns or fossil imprints.