sedimentary
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
Hardness: 3-6 (variable), Color: Yellow-brown to ochre, Luster: Dull or earthy, Structure: Granular or clastic, Cleavage: None
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Physical properties
Hardness: 3-6 (variable), Color: Yellow-brown to ochre, Luster: Dull or earthy, Structure: Granular or clastic, Cleavage: None
Formation & geological history
Formed through the accumulation of sand-sized silicate grains followed by the secondary oxidation and infiltration of iron-rich groundwater, creating rust-like staining or Liesegang rings.
Uses & applications
Used primarily in construction aggregate, as a decorative landscape stone, and historically as a low-grade iron ore or pigment (ochre).
Geological facts
The yellow-orange banding is often caused by 'Liesegang rings', which are periodic precipitation patterns of iron oxides within the porous rock matrix.
Field identification & locations
Identify by the sandy texture and the characteristic ochre-colored staining that leaves a yellow-brown streak. Found globally in sedimentary basins.
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