sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Hardness: 6-7 (Mohs); Color: Pink, reddish-brown, tan, and orange due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.1-2.6
- Hardness
- 6-7 (Mohs)
- Color
- Pink, reddish-brown, tan, and orange due to iron oxide
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Pink, reddish-brown, tan, and orange due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.1-2.6
Formation & geological history
Formed through the accumulation and lithification of sand-sized silicate grains. The pink and red bands indicate iron oxide precipitation during or after deposition in an oxygen-rich environment, typical of deserts or riverbeds throughout various geological periods.
Uses & applications
Used widely as a building material, decorative stone for landscaping, and in glass manufacturing (if high purity silica). Often used as a decorative collector's piece due to colorful banding.
Geological facts
Sandstone makes up about 10-20% of Earth's sedimentary rocks. The colorful patterns are often called 'wonderstone' or 'picture sandstone' when the banding creates landscape-like images.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering or banding. Common in the Colorado Plateau, Grand Canyon, and various desert regions globally. Collectors should look for distinct, vibrant bands of color.
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