Cadmoindite
{{Short description|Cadmium indium sulfide mineral}}
{{Infobox mineral
| name = Cadmoindite
| category = Sulfide mineral
Thiospinel group
Spinel structural group
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| image = Cadmoindite.jpg
| imagesize = 260px
| caption = Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation
| formula = CdIn2S4
| molweight = 470.32 g/mol
| strunz = 2.DA.05
| system = Cubic
| class = Hexoctahedral (m{{overline|3}}m)
H-M symbol (4/m {{overline|3}} 2/m)
| symmetry = Fd{{overline|3}}m
| unit cell = a = 10.81 Å; Z = 8
| color = Black to dark brown
| habit = Microscopic octahedral crystals
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| fracture = Conchoidal
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| luster = Adamantine
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| opticalprop = Isotropic
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| diaphaneity = translucent
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| references = [http://www.webmineral.com/data/Cadmoindite.shtml Cadmoindite Webmineral Data][http://www.mindat.org/min-27212.html Cadmoindite mineral information from Mindat.org]
}}
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{{cite journal|last1=Ursaki|first1=V. V.|last2=Manjon|first2=F. J.|last3=Tiginyanu|first3=I. M.|last4=Tezlevan|first4=V. E.|title=Raman scattering study of pressure-induced phase transitions in MIn2S4 spinels|journal=J. Phys.: Condens. Matter|date=2002|volume=14|issue=27|page=6801|doi=10.1088/0953-8984/14/27/304}} and density functional theory simulations{{cite journal|last1=Seminovski|first1=Y.|last2=Palacios|first2=P.|last3=Wahnon|first3=P. M.|last4=Grau-Crespo|first4=R.|title=Band gap control via tuning of inversion degree in CdIn2S4 spinel|journal=Applied Physics Letters|date=2012|volume=100|issue=10|page=102112|doi=10.1063/1.3692780|arxiv=1202.4752|bibcode=2012ApPhL.100j2112S|s2cid=95687937}} indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.
References
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Category:Minerals in space group 227
Category:Minerals described in 2004
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