Table 3. Crystal composition of the top five candidate crystal structures ranked by ClusterFinder for the simulated PDF from the Al₁₂O₄₀ ɛ-Keggin cluster cut out from the spinel MgAl₂O₄ crystal structure.

Ranked structure	Crystal composition	Reference
(I)	NiAl2O4	Vegard & Borlaug (1943 ▸)
(II)	MgAl2O4	Zorina & Kvitka (1968 ▸)
(III)	ZnAl2O4	Holgersson (1927 ▸)
(IV)	ZnAl2O4	Vegard & Borlaug (1943 ▸)
(V)	ZnAl2O4	Saalfeld (1964 ▸)