Cadmoindite (CdIn₂S₄) is a rare

cadmium Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it demonstrates oxidation state +2 in most of ...

indium Indium is a chemical element with the symbol In and atomic number 49. Indium is the softest metal that is not an alkali metal. It is a silvery-white metal that resembles tin in appearance. It is a post-transition metal that makes up 0.21 parts ...

sulfide mineral The sulfide minerals are a class of minerals containing sulfide (S2−) or disulfide (S22−) as the major anion. Some sulfide minerals are economically important as metal ores. The sulfide class also includes the selenides, the tellurides, th ...

discovered in

Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive region, geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a ...

around the vent of a high-temperature (450–600 °C)

fumarole A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

at the

Kudriavy volcano Medvezhya (russian: Медве́жий; ja, 茂世路岳, ''Moyoro-dake'') is a volcanic complex located at the northern end of Iturup Island, Kuril Islands, Russia. Rheniite, a rhenium sulfide mineral (ReS2), was discovered and approved in 2004 ...

Iturup Island , other_names = russian: Итуру́п; ja, 択捉島 , location = Sea of Okhotsk , coordinates = , archipelago = Kuril Islands , total_islands = , major_islands = , area_km2 = 3139 , length_km = 200 , width_km = 27 , coastline = , highest_moun ...

in the

Kuril Islands The Kuril Islands or Kurile Islands (; rus, Кури́льские острова́, r=Kuril'skiye ostrova, p=kʊˈrʲilʲskʲɪjə ɐstrɐˈva; Japanese: or ) are a volcanic archipelago currently administered as part of Sakhalin Oblast in the ...

. It has also been reported from the Kateřina Coal Mine in Bohemia,

Czech Republic The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The ...

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 Isoelectronicity is a phenomenon observed when two or more molecules have the same structure (positions and connectivities among atoms) and the same electronic configurations, but differ by what specific elements are at certain locations in th ...

, but both Raman spectroscopy measurements on synthetic samples and

density functional theory Density-functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate the electronic structure (or nuclear structure) (principally the ground state) of many-body ...

simulations indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.

References

Cadmium minerals Indium minerals Thiospinel group Cubic minerals Minerals in space group 227 Minerals described in 2004 {{sulfide-mineral-stub