Cadmoindite

{{Short description|Cadmium indium sulfide mineral}} {{Infobox mineral | name = Cadmoindite | category = Sulfide mineral <br />Thiospinel group <br />Spinel structural group | boxwidth = | boxbgcolor = | image = Cadmoindite.jpg | imagesize = 260px | caption = Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation | formula = CdIn₂S₄ | IMAsymbol=Cad<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = 470.32 g/mol | strunz = 2.DA.05 | system = Cubic | class = Hexoctahedral (m{{overline|3}}m) <br/>H-M symbol (4/m {{overline|3}} 2/m) | symmetry = ''Fd''{{overline|3}}m | unit cell = a = 10.81&nbsp;Å; Z&nbsp;=&nbsp;8 | color = Black to dark brown | habit = Microscopic octahedral crystals | twinning = | cleavage = | fracture = Conchoidal | tenacity = | mohs = | luster = Adamantine | polish = | refractive = | opticalprop = Isotropic | birefringence = | dispersion = | pleochroism = | fluorescence= | absorption = | streak = | gravity = | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = translucent | other = | references = <ref name=Webmin>[http://www.webmineral.com/data/Cadmoindite.shtml Cadmoindite Webmineral Data]</ref><ref name=Mindat>[http://www.mindat.org/min-27212.html Cadmoindite mineral information from Mindat.org]</ref> }} '''Cadmoindite''' (CdIn₂S₄) is a rare cadmium indium sulfide mineral discovered in Siberia around the vent of a high-temperature (450–600&nbsp;°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.<ref name=Mindat/>

==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<ref>{{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|doi-access=free}}</ref> and density functional theory simulations<ref>{{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}}</ref> indicate that about 20% of the tetrahedral sites are occupied by In(III) cations.

==References== {{reflist}}

Category:Cadmium minerals Category:Indium minerals Category:Thiospinel group Category:Cubic minerals Category:Minerals in space group 227 Category:Minerals described in 2004

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