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Iron chromite or Magnesium chromite can be fused with Sodium hydroxide in air.  They produce iron oxide or magnesium oxide,  sodium chromate, and water.
     4  Fe Cr₂ O₃ + 16 Na OH + 7 O₂  ⇒⇒  2 Fe₂ O₃ + 8 H₂O + 8 Na₂ Cr O₄

Iron chromite can also be represented as   FeO. Cr₂O₂ . x H₂O

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