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A new AlB 12  structure ( γ ) is described and its relation to  α  AlB 12  defined. The  γ  structure is polytypically related to  α  AlB 12  in having a 2-layer (rather than 3-layer) stacking along a normal to (101)  α   (≈ [201]  α  ). The  α – γ  relationship involves cell twinning on every (101)  α   layer, using a normal to (101)  α   as the rotary twin operator, the latter being derived from space group considerations. Implications of the relationship are discussed,  γ  AlB 12  crystals are hematitelike, lath-shaped, often syntaxically intergrown with  α  AlB 12 . The unit cell is orthorhombic with  a  = 16.56 Å,  b  = 17.53 Å,  c  = 10.16 Å,  Z  = 29, space group  P 2 1 2 1 2 1 . Morphological data are presented.

γ AlB 12 , a new structure, and its relation to α AlB 12 as shown by twinned space groups