sedimentary
Sandstone (likely Navajo Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale) for quartz grains; Color: Red, orange, tan, and buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale) for quartz grains
- Color
- Red, orange, tan, and buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale) for quartz grains; Color: Red, orange, tan, and buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the lithification of wind-blown sand dunes in a vast desert ecosystem during the Early Jurassic period (approx. 180-190 million years ago).
Uses & applications
Used in construction as dimension stone, for landscaping, and as a reservoir rock for oil, gas, and groundwater. Highly valued for recreation (hiking, mountain biking, off-roading).
Geological facts
This specific formation in Moab, Utah, is famous for its 'petrified' sand dunes which exhibit large-scale cross-bedding, showing the direction of ancient winds.
Field identification & locations
Identify by its gritty sandpaper feel, visible sand grains, and distinct bedding layers. Common in the Colorado Plateau of the United States.
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