Greigite (Fe3S4) is said to have the spinel structure, Fd3m,
a ~ 9.88 Angstroms. No atomic coordinate available, but 96
spinel entries are in ICSD.
Best wishes,
Armel Le Bail - Université du Maine, Laboratoire des Fluorures,
CNRS ESA 6010, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
http://www.cristal.org/