Multiple choice Which of the following is an example of normal spinels? Mn3O4 and NiFe2O4 Fe3O4 and Co3O4 Co3O4 and MgAl2O4 NiFe2O4 and MgAl2O4 Fe3O4 and Mn3O4 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Both Co3O4 and MgAl2O4 are normal spinels.