sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grayish-yellow; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Feel: Gritty like sandpaper.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or grayish-yellow
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grayish-yellow; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Feel: Gritty like sandpaper.
Formation & geological history
Formed from 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
Used primarily in construction as a building stone, for making grindstones, or as an ornamental landscaping rock.
Geological facts
Sandstone occupies roughly 20-25% of all sedimentary rocks on Earth. It acts as a massive natural filter and reservoir for groundwater and petroleum.
Field identification & locations
Identify in the field by its gritty texture and visible sand grains. It common in areas with ancient dried-up sea beds or river deltas. Wetting the stone often makes the grainy texture more apparent.
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