mineral
Yellow Ochre (Limonite)
Limonite (FeO(OH)·nH2O)
Hardness: 4-5.5 (Mohs), Color: Yellowish-brown to mustard yellow, Luster: Dull/Earthy, Crystal Structure: Amorphous (often pseudomorphous), Streak: Yellow-brown.
- Hardness
- 4-5
- Streak
- Yellow-brown
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Physical properties
Hardness: 4-5.5 (Mohs), Color: Yellowish-brown to mustard yellow, Luster: Dull/Earthy, Crystal Structure: Amorphous (often pseudomorphous), Streak: Yellow-brown.
Formation & geological history
Formed by the oxidation and weathering of iron-rich mineral deposits (like pyrite or magnetite) in sedimentary or hydrothermal environments.
Uses & applications
Historically used as a natural pigment in paints and ceramics; also an ore of iron and a popular collector specimen.
Geological facts
Yellow ochre is one of the oldest pigments known to humanity, used in prehistoric cave paintings over 30,000 years ago.
Field identification & locations
Identified by its distinctive earthy yellow color and yellowish-brown streak. Commonly found in bog iron deposits or gossans. Collectors look for solid, brightly colored masses.
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Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
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