Question:
Which mineral(s) among the following represent(s) AB2O4 composition?
Which mineral(s) among the following represent(s) AB2O4 composition?
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Spinel group formula: AB\textsubscript{2}O\textsubscript{4}, with A = divalent and B = trivalent cation.
Updated On: Dec 6, 2025
- Spinel
- Magnetite
- Chromite
- Ilmenite
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The Correct Option is A, B, C
Solution and Explanation
Step 1: Understanding spinel group formula.
Minerals with the general formula AB2O4 have a cubic (isometric) spinel structure. In this structure, ‘A’ is a divalent cation and ‘B’ is a trivalent cation.
Step 2: Classification.
- Spinel: MgAl2O4 → AB2O4 type.
- Magnetite: Fe2+Fe23+O4 → AB2O4 type (inverse spinel).
- Chromite: FeCr2O4 → AB2O4 type.
- Ilmenite: FeTiO3 → Not spinel type (belongs to rhombohedral structure).
Step 3: Conclusion.
Hence, the minerals Spinel, Magnetite, and Chromite have AB2O4 composition.
Minerals with the general formula AB2O4 have a cubic (isometric) spinel structure. In this structure, ‘A’ is a divalent cation and ‘B’ is a trivalent cation.
Step 2: Classification.
- Spinel: MgAl2O4 → AB2O4 type.
- Magnetite: Fe2+Fe23+O4 → AB2O4 type (inverse spinel).
- Chromite: FeCr2O4 → AB2O4 type.
- Ilmenite: FeTiO3 → Not spinel type (belongs to rhombohedral structure).
Step 3: Conclusion.
Hence, the minerals Spinel, Magnetite, and Chromite have AB2O4 composition.
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