Cadmoindite

Cadmoindite
	Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation
General
Category	Sulfide mineral ; Thiospinel group ; Spinel structural group
Formula; (repeating unit)	CdIn2S4
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	[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

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.

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References

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: 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: 102112. arXiv:1202.4752. Bibcode:2012ApPhL.100j2112S. doi:10.1063/1.3692780.

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[Webmin-1] Cadmoindite Webmineral Data

[Mindat-2] Cadmoindite mineral information from Mindat.org

[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.