| Cadmoindite | |
|---|---|
 Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation | |
| General | |
| Category | Sulfide mineral Thiospinel group Spinel structural group |
| Formula (repeating unit) | CdIn2S4 |
| IMA symbol | Cad |
| 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 |
| Identification | |
| 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 | |
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.
Crystal structure
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 and density functional theory simulations indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Cadmoindite Webmineral Data
- ^ Cadmoindite mineral information from Mindat.org
- 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 (27): 6801. doi:10.1088/0953-8984/14/27/304.
- 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 (10): 102112. arXiv:1202.4752. Bibcode:2012ApPhL.100j2112S. doi:10.1063/1.3692780. S2CID 95687937.
 | This article about a specific sulfide mineral is a stub. You can help Misplaced Pages by expanding it. |