From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation
CategorySulfide mineral
Thiospinel group
Spinel structural group
(repeating unit)
Strunz classification2.DA.05
Crystal systemCubic
Crystal classHexoctahedral (m3m)
H-M symbol (4/m 3 2/m)
Space groupFd3m
Unit cella = 10.81 Å; Z = 8
Formula mass470.32 g/mol
ColorBlack to dark brown
Crystal habitMicroscopic octahedral crystals
Optical propertiesIsotropic
References[1] [2]

Cadmoindite (CdIn2S4) is a rare cadmium indium sulfide mineral discovered in Siberia around the vent of a high-temperature (450–600 °C) fumarole at the Kudriavy volcano, Iturup Island in the Kuril Islands. It has also been reported from the Kateřina Coal Mine in Bohemia, Czech Republic.[2]

Crystal Structure[edit]

CdIn2S4 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[3] and density functional theory simulations[4] indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.


  1. ^ Cadmoindite Webmineral Data
  2. ^ a b Cadmoindite mineral information from
  3. ^ Ursaki, V. V.; Manjon, F. J.; Tiginyanu, I. M.; Tezlevan, V. E. (2002). "Raman scattering study of pressure-induced phase transitions in MIn2S4 spinels". J. Phys.: Condens. Matter. 14: 6801. doi:10.1088/0953-8984/14/27/304.
  4. ^ Seminovski, Y.; Palacios, P.; Wahnon, P. M.; Grau-Crespo, R. (2012). "Band gap control via tuning of inversion degree in CdIn2S4 spinel". Applied Physics Letters. 100: 102112. arXiv:1202.4752. Bibcode:2012ApPhL.100j2112S. doi:10.1063/1.3692780.