sedimentary
Red Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
Hardness: 6-7 (Mohs); Color: reddish-brown to purple-brown; Luster: dull/earthy; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- reddish-brown to purple-brown
- Luster
- dull/earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: reddish-brown to purple-brown; Luster: dull/earthy; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized grains, typically in arid environments like deserts or river basins. The reddish color comes from iron oxide (hematite) coating the grains.
Uses & applications
Commonly used as a building material, decorative landscaping stone, and occasionally for minor lapidary work or historical carvings.
Geological facts
Many iconic landscapes, such as the Grand Canyon and Petra, are composed largely of various sandstone layers. This specific specimen shows water-worn rounding, likely from a river or beach environment.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible layers or bedding. It is widely distributed across North America and Europe. Look for it in dry washes or along coastlines near sedimentary cliffs.
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