Mineral 1.0Test your knowledge of specific minerals

Material: All | Carbonates | Halides | Hydroxides | Native elements | Oxides | Phosphates | Silicates | Sulfates | Sulfides
Difficulty: Normal | Hard
  

Identify the following mineral by clicking on the buttons below to reveal its properties one by one. For a harder/more specific test, choose from the test material above.

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Known/experimental properties:
Habit: Massive, platey or dendritic habit.
Lustre: Metallic
Hardness: 2.5 - 3
Cleavage: None
Fracture: Hackly
Streak: Same
Rxn w/ Acid: Weak
Magnetism: None
Specific Gravity: 8.9

Hint: Colour and metallic characteristics are diagnostic.

  

Answer:
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