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Contact Person Shah
Ras Al-Haymah, Ras Al-Khaymah
Chromite is the most
important ore of chromium from which it derives its name. Chromium
is an important metal and has a wide range of industrial
uses.
Chromite forms in deep ultra-mafic magmas and is one of the first
minerals to crystallize. It is because of this fact that chromite
is found in some concentrated ore bodies. While the magma is slowly
cooling inside the Earth's crust, chromite crsytals are forming and
because of their density, fall to the bottom and are concentrated
there.
Although its primary origin is ultra-mafic rocks such as
peridotites, chromite is also found in metamorphic rocks such as
serpentites. Chromite, as is indicated by its early crystallization
is resistant to the altering affects of high temperatures and
pressures. Thus it is capable of going through the metamorphic
processes unscathed, while other minerals around it are being
altered to serpentine, biotite and garnets. This characteristic
also explains chromites use as a refractory component in the bricks
and linings of blast furnaces.
Usually magnesium is present in chromite substituting for the iron
and in fact a solid solution series exists between chromite and the
much rarer mineral magnesiochromite. All chromite specimens in
nature contain some magnesium, likewise all natural
magnesiochromites contain some iron. Magnesiochromite is grayer in
color and in streak and has a slightly lower density than chromite
at a specific gravity of 4.2 to 4.4.
Hardness
5.5
Chemical/Typical composition |
characteristics |
Field Indicators |
|
olivine serpentine uvarovite pyroxenes magnetite anorthite |
brownish black to a deep dark black |
metallic to greasy |
|
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