Other Definitions
chromite (dict)

Chromite

olspan=2 align=center|Chromite
olspan=2|
olspan=2|General
ategory Mineral
a href="/encyclopedia/Chemical-formula" title="Chemical formula">Chemical formula iron magnesium chromium oxide:(Fe,Mg)Cr2O4
olspan=2|Identification
Color Black to brownish black
Crystal habit Octahedral rare; massive to granular
Crystal system Isometric; hexoctahedral
Cleavage absent
Fracture Conchoidal
Mohs Scale hardness 5.5
Luster Submetallic
Refractive index Subtranslucent to opaque
Pleochroism N/A
Streak Dark brown
Specific gravity 4.5 - 4.8
Fusibility Infusable
Solubility ?
Other Characteristics Weakly magnetic
olspan=2|Major varieties
agnesiochromite
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Chromite, iron magnesium chromium oxide: (Fe,Mg)Cr2O4, is an oxide mineral belonging to the spinel group. Magnesium is always present in variable amounts, also aluminium and iron substitute for chromium. Chromite is found in peridotite and other layered ultramafic intrusive rocks and also found in metamorphic rocks such as serpentinites. Ore deposites of chromite form as early magmatic differentiates. It is commonly associated with olivine, magnetite, serpentine, and corundum. Chromite is the chief ore of chromium.

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