What do you mean by spinel type structure?
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Structure of Spinels (AB2O4):
The divalent AII ions occupy the tetrahedral voids, whereas the trivalent BIII ions occupy the octahedral voids in the close packed arrangement of oxide ions.
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....A normal spinel can be represented as:
(AII)tet(BIII)2octO4
E.g. MgAl2O4 (known as spinel), Mn3O4, ZnFe2O4, FeCr2O4 (chromite) etc.
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