Cadmoindite (CdIn<sub>2</sub>S<sub>4</sub>) is a rare cadmium indium sulfide mineral discovered in Siberia around the vent of a high-temperature (450âÂÂ600 ðC) fumarole at the Kudriavy volcano, Iturup Island in the Kuril Islands. It has also been reported from the Kateà Âina Coal Mine in Bohemia, Czech Republic.
CdIn<sub>2</sub>S<sub>4</sub> exhibits the spinel structure, which can be described by a cubic unit cell with 8 tetrahedrally coordinated and 16 tetrahedrally coordinated cation sites. The distribution of Cd(II) and In(III) over the cation sites is difficult to elucidate from standard X-ray diffraction techniques because the two species are isoelectronic, but both Raman spectroscopy measurements on synthetic samples and density functional theory simulations indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.