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Figure 1
Structure of MgxLi3 − xMg48 − y showing the atom-labelling scheme and displacement ellipsoids drawn at the 30% probability level. Two kinds of boride polyhedra are indicated – green [B12] icosa­hedra and yellow fused [B21] double icosa­hedra – and the two mixed Li/Mg sites M1 and M2. [Symmetry codes: (i) −y + 1, −x + 1, −z + [{1\over 2}]; (ii) −y + [{1\over 2}], x + [{1\over 2}], z − [{1\over 4}]; (iii) x + [{1\over 2}], −y + 1.5, −z + [{1\over 4}]; (iv) y, x, −z.]

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