| Category | Oxide mineral |
| Formula (repeating unit) | γ-AlO(OH) |
| Crystal symmetry | Orthorhombic 2/m 2/m 2/m |
| Unit cell | a = 3.693 Å, b = 12.221 Å, c = 2.865 Å; Z = 4 |
| Category | Oxide mineral – Hematite group |
| Formula (repeating unit) | Aluminium oxide,Al 2O 3 |
| Crystal symmetry | Trigonal (32/m) |
| Unit cell | a = 4.75 Å, c = 12.982 Å; Z=6 |
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