sedimentary
Hematitic Sandstone
Sandstone with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6-7 (Mohs); Color: Grey with distinct reddish-purple hematite bands; Luster: Dull, earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None
- Hardness
- 6-7 (Mohs)
- Color
- Grey with distinct reddish-purple hematite bands
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Grey with distinct reddish-purple hematite bands; Luster: Dull, earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized grains, with iron oxide (hematite) leaching into the layers during lithification in oxygen-rich environments.
Uses & applications
Used primarily as construction aggregate, building stone, and occasionally as a low-grade iron ore source or decorative garden stone.
Geological facts
The red color in this specimen is caused by the oxidation of iron, literally the same process that causes rust. Sandstone makes up about 20% of all sedimentary rocks on Earth.
Field identification & locations
Identify by the gritty sand-paper texture and the characteristic reddish staining that does not rub off. Common in sedimentary basins and canyon walls.
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