Limonite

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Other names: Yellow ochre, bog iron ore
Mineral class: Oxide, Hydroxide
Composition: Hydrated iron oxide or hydroxide. FeO(OH) nH₂O + Fe₂O₃ nH₂O
Hardness: Variable (1 - 5)
Luster: Earthy, glassy
Color: Dark yellow-brown to black
Streak: Yellow-brown
Crystal form: Earthy masses. None apparent.
Environment: Concretions and impurities in sedimentary formations
Uses: Occasional use as an iron ore
Comments: Will often mark paper; may be scratched by knife. Formed from weathering or alteration of iron-containing minerals. May give yellow cast to limestones and shales. [limonite.jpg]

Other names:	Yellow ochre, bog iron ore
Mineral class:	Oxide, Hydroxide
Composition:	Hydrated iron oxide or hydroxide. FeO(OH) nH₂O + Fe₂O₃ nH₂O
Hardness:	Variable (1 - 5)
Luster:	Earthy, glassy
Color:	Dark yellow-brown to black
Streak:	Yellow-brown
Crystal form:	Earthy masses. None apparent.
Environment:	Concretions and impurities in sedimentary formations
Uses:	Occasional use as an iron ore
Comments:	Will often mark paper; may be scratched by knife. Formed from weathering or alteration of iron-containing minerals. May give yellow cast to limestones and shales.