Chromite

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Chemical Name:	Iron Chromium Oxide
Chemical Formula:	FeCr2O4

This is the most important ore of chromium, the element from which chromite derives its name. Chromite is found in ultra-mafic rocks amd forms in deep ultra-mafic magmas where it is one of the first minerals to crystallize. While the magma slowly cools, chromite crystals "snowing" into concentrated areas near the bottom of the magma due to their density. Chromite is resistant to the altering effects of high pressures and temuratures and is used as a refractory component in the bricks and linings of blast furnaces.
Magnesium is present in all natural chromites and sometimes replaces the iron to for the much rarer mineral magnesiochromite. All magnesiochromites contain some iron and both minerals form a series between them.