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The crystal structure of the rare, spinel-related Sb mineral filipstadite from Långban, Filipstad district, Värmland, Sweden, has been solved and refined in the space group Fd3̄m [a = 25.9300(6) Å, V = 17434.4(5) Å 3 , and Z = 216] and refined to R = 4.41% for 681 F o  &gt; 4σ(F o ) using MoKα X-ray data. The structure of filipstadite is topologically identical to the spinel-type structure with cations occupying 1/8 of the tetrahedral (T) and 1/2 of the octahedral (M) interstices of a cubic close-packing of oxygen atoms. Due to the cation ordering, which leads to the tripling of the unit-cell edge, the M and T sites of the spinel-type structure split into six and five independent sites, respectively. Chemical composition was determined by electron microprobe. The fractions of major cations obtained from chemical analysis were distributed between T and M sites taking into account the weighted electron number at both T and M sites, and minimizing the discrepancy between the calculated and the observed overall &lt;M-O&gt; distance. Cations present in minor amounts were assigned on the basis of their known site preference. The obtained populations (2M = Mn 2+   0.56 Mg 0.76 Fe 3+  0.16 Al 0.02 Sb 5+   0.50 ; T = Mn 2+   0.60 Mg 0.07 Fe 3+  0.30  Zn 0.02 Si 4+   0.01 ) were then tentatively distributed among the individual M and T sites on the basis of crystal chemical considerations.

Superstructure, crystal chemistry, and cation distribution in filipstadite, a Sb 5+ -bearing, spinel-related mineral