sedimentary

Red Sandstone

Ferruginous Sandstone

Hardness: 6-7 (Mohs); Color: reddish-brown to maroon due to iron oxide; Luster: dull to earthy; Texture: fine to medium-grained clastic; Cleavage: none; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: reddish-brown to maroon due to iron oxide
Luster: dull to earthy

Identified July 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: reddish-brown to maroon due to iron oxide; Luster: dull to earthy; Texture: fine to medium-grained clastic; Cleavage: none; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles (primarily quartz) in terrestrial environments like deserts or river basins, colored by hematite weathering during the Paleozoic or Mesozoic eras.

Uses & applications

Primarily used as a building material, ornamental stone, paving, and in glass manufacturing if the silica content is high enough. Often used for flagstones in landscaping.

Geological facts

The distinctive red color is caused by the oxidation of iron minerals, essentially making the rock 'rusted.' Red sandstone is the primary material of many famous landmarks, including the 'Red Rocks' of Colorado and Petra in Jordan.

Field identification & locations

Identify in the field by its gritty texture and visible sand grains. It is commonly found in sedimentary basins and arid regions. Collectors look for unique layering or cross-bedding patterns.