sedimentary
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
AI-generated identification · may be incorrectHardness: 5-6 (variable), Color: Dark brown to reddish-orange, Luster: Dull/Earthy, Structure: Granular or concretionary, heavy for its size due to iron content.
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Physical properties
Hardness: 5-6 (variable), Color: Dark brown to reddish-orange, Luster: Dull/Earthy, Structure: Granular or concretionary, heavy for its size due to iron content.
Formation & geological history
Formed through the chemical precipitation of iron oxides within sedimentary layers, or as a residual deposit from the weathering of other iron-rich rocks. Common in terrestrial and shallow marine environments.
Uses & applications
A historic source of iron ore; currently used as a decorative stone, in construction as road metal, and for landscaping.
Geological facts
Ironstone concretions can sometimes form 'rattle stones' where a loose core creates sound. Famous deposits provided the raw material for the Industrial Revolution in regions like the English Midlands.
Field identification & locations
Identify by its characteristic rusty red-brown streak, high density, and localized staining of surrounding soil. Frequently found in riverbeds and eroded hillsides.
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