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Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation
Category Sulfide mineral
Thiospinel group
Spinel structural group
(repeating unit)
Strunz classification 2.DA.05
Crystal system Cubic
Crystal class Hexoctahedral (m3m)
H-M symbol (4/m 3 2/m)
Space group Fd3m
Unit cell a = 10.81 Å; Z = 8
Formula mass 470.32 g/mol
Color Black to dark brown
Crystal habit Microscopic octahedral crystals
Fracture Conchoidal
Luster Adamantine
Diaphaneity translucent
Optical properties Isotropic
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. doi:10.1063/1.3692780.