Mineral 1.0: Chromite

Mineral 1.0

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ChromiteFeCr₂O₄

Class: Oxide
Hardness: 5.5
Density: 4.5 - 4.8
Streak: Brown
Lustre: Metallic to pitchy
Habit: Fine grained aggregate.
Colours: Black
   Crystal System: Isometric
Cleavage: None
Fracture: Uneven
Magnetism: Weak
Reaction with HCl: Unknown
Identification in hand sample:
Resembles magnetite and ilmenite, but not very magnetic and has a more resinous lustre.
Associations:
Found in mafic and ultramafic igneous rocks such as gabbro, peridotite, dunite and pyroxenite as an accessory mineral.
Industrial / ecomonic uses:
Only ore mineral for chromium.



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