sedimentary

Red Sandstone

Arenite

Hardness: 6-7 (Mohs scale, variable based on cementation); Color: Reddish-brown to tan; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale, variable based on cementation)
Color: Reddish-brown to tan
Luster: Dull/Earthy

Identified June 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale, variable based on cementation); Color: Reddish-brown to tan; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. The red color indicates the presence of iron oxide (hematite) during the deposition in terrestrial environments like deserts or river floodplains.

Uses & applications

Widely used as a construction material for flagstones, pavers, and decorative masonry. Historically significant for building monuments and cathedrals.

Geological facts

The famous red cliffs of the Grand Canyon and the 'Red Rocks' of Colorado are primarily composed of these sandstones. It often preserves sedimentary structures like cross-bedding and ripple marks.

Field identification & locations

Identify by its gritty, sandpaper-like feel and the visible sand grains. It is commonly found in sedimentary basins and arid regions globally. Collectors look for unique weathering patterns or fossil inclusions.