Chemistry. a salt of chromium in the bivalent state.
Mineralogy. a cubic mineral, ferrous chromate, Fe 3 Cr 2 O 3 , usually with much of the ferrous iron and aluminum replaced by magnesium, and some of the chromium by ferric iron: the principal ore of chromium.

1830–40; chrom(ium) or chrom(ate) + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chromite (ˈkrəʊmaɪt)
1.  a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form, occurring principally in basic igneous rocks: the only commercial source of chromium and its compounds. Formula: FeCr2O4
2.  a salt of chromous acid

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Example sentences
It turned out to be a meeting to settle a dispute over a chromite mine.
World chromite ore reserves are more than adequate to meet anticipated world demand.
Chromite ore and other chromium materials are not traded on commodity or
  futures exchanges.
Chromite ore production is moving from independent producers to vertically
  integrated producers.
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