Mineral 1.0: Limonite

Mineral 1.0

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LimoniteFeO(OH) - nH₂O

Class: Hydroxide
Hardness: 5 - 5.5
Density: 2.7 - 4.3
Streak: Yellow-brown
Lustre: Earthy
Habit: Fine grained aggregate, powdery coating.
Colours: Orange, yellow-brown
   Crystal System: Unknown
Cleavage: None
Fracture: Uneven
Magnetism: None
Reaction with HCl: Very weak
Identification in hand sample:
Colour is best indicator, followed by habit.
Associations:
Common weathering product of iron-rich rocks.
Comments:
The fine brownish coloured mineral is usually weathered goethite.



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