sedimentary
Iron-rich sandstone (Gozan/Ironstone)
Ferruginous Sandstone (clastic sedimentary rock)
Hardness: 6-7 (approximate); Color: Rusty brown, earthy orange, dark ochre; Luster: Dull, earthy; Crystal structure: Granular/clastic; Cleavage: None; Highly porous and rough texture.
- Hardness
- 6-7 (approximate)
- Color
- Rusty brown, earthy orange, dark ochre
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (approximate); Color: Rusty brown, earthy orange, dark ochre; Luster: Dull, earthy; Crystal structure: Granular/clastic; Cleavage: None; Highly porous and rough texture.
Formation & geological history
Formed through the cementation of sand grains by iron oxides (limonite or hematite) precipitated from groundwater. Often signifies the oxidation of iron sulfide minerals near the surface or deposition in boggy, oxygen-rich environments.
Uses & applications
Historically used as a low-grade iron ore ('bog iron'); occasionally used locally as a building stone or for road fill due to its durability once hardened.
Geological facts
Rocks like this are often referred to as 'ironstone'. In some cases, these specimens are part of a 'gossan' or iron hat, which miners used as an indicator that valuable metal deposits (like copper or gold) might be located deeper underground.
Field identification & locations
Identify in the field by its distinct rusty color, high weight compared to similar-looking rocks (due to iron content), and the fact it will leave a yellowish-brown streak on a ceramic plate. Look in areas with high mineral leaching or near coal beds.
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