sedimentary
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
Fine-grained earthy texture, mustard yellow to brownish-yellow color, dull/earthy luster, Mohs hardness 1-5 (variable as powder), specific gravity ~3.0-4.0
Identified More sedimentary →
Explore Yellow Ocher (Iron-rich Silt/Clay) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Fine-grained earthy texture, mustard yellow to brownish-yellow color, dull/earthy luster, Mohs hardness 1-5 (variable as powder), specific gravity ~3.0-4.0
Formation & geological history
Formed through the weathering of iron-bearing minerals in soil and sedimentary layers, typically in oxidized zones of ore deposits or within clay-rich sedimentary environments.
Uses & applications
Used primarily as a natural earth pigment for paints, dyes, and cosmetics. Historically significant in rock art and pottery glazes.
Geological facts
Ocher is one of the oldest pigments used by humans, with evidence of use dating back over several hundred thousand years in early human history and cave paintings.
Field identification & locations
Can be identified by its distinct staining property and earthy smell when damp. Commonly found in oxidized iron zones or as a secondary mineral in clay beds. Collectors value it as a raw pigment source.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Shale
Shale (clastic sedimentary rock)
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary