sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown, or buff; Luster: Dull to earthy; Texture: Granular/gritty like sandpaper; Structure: Clastic
- Hardness
- 6-7 Mohs
- Color
- Tan, yellowish-brown, or buff
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown, or buff; Luster: Dull to earthy; Texture: Granular/gritty like sandpaper; Structure: Clastic
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or marine environments over millions of years.
Uses & applications
Commonly used as a building material, in paving, for making grindstones, and as a source of silica for glass manufacturing.
Geological facts
Sandstone accounts for approximately 20 to 25 percent of all sedimentary rocks on Earth. The color is often determined by the presence of iron oxides like goethite or limonite.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. It is extremely common worldwide in outcrop formations and as river pebbles.
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Arenite (if sandstone)
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Brown Sandstone (River Rock)
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