sedimentary
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, yellow, or buff; Luster: Dull/Earthy; Crystal structure: Granular; Cleavage: None; Specific gravity: 2.3-2.6
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, yellow, or buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, yellow, or buff; Luster: Dull/Earthy; Crystal structure: Granular; Cleavage: None; Specific gravity: 2.3-2.6
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains, usually quartz and feldspar, in environments such as deserts, beaches, or riverbeds. Over time, pressure and mineral-rich waters turn loose sand into solid rock.
Uses & applications
Commonly used in construction for paving and building stone. Highly valued by collectors if it contains fossils or unique weathering patterns. Also used in glass manufacturing and as a source for silica.
Geological facts
Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. This specific rounded specimen (a river pebble) shows signs of water-driven erosion, which smoothed its rough edges over long periods of transport.
Field identification & locations
Identify in the field by its sandpaper-like gritty texture. Unlike limestone, it will not fizz when exposed to acid. Found globally in basins and near current or ancient coastlines.
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