# Cadmoindite

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{{Short description|Cadmium indium sulfide mineral}}
{{Infobox mineral
| name        = Cadmoindite
| category    = [Sulfide mineral](/source/Sulfide_mineral) <br />[Thiospinel group](/source/Thiospinel_group) <br />Spinel structural group 
| boxwidth    = 
| boxbgcolor  = 
| image       = Cadmoindite.jpg
| imagesize   = 260px
| caption     = Cadmoindite, from Kudriavy Volcano, Far Eastern Region, Russian Federation
| formula     = CdIn<sub>2</sub>S<sub>4</sub>
| 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](/source/Cubic_crystal_system)
| class       = Hexoctahedral (m{{overline|3}}m) <br/>[H-M symbol](/source/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''' (CdIn<sub>2</sub>S<sub>4</sub>) is a rare [cadmium](/source/cadmium) [indium](/source/indium) [sulfide mineral](/source/sulfide_mineral) discovered in [Siberia](/source/Siberia) around the vent of a high-temperature (450–600&nbsp;°C) [fumarole](/source/fumarole) at the [Kudriavy volcano](/source/Kudriavy_volcano), [Iturup Island](/source/Iturup_Island) in the [Kuril Islands](/source/Kuril_Islands). It has also been reported from the Kateřina Coal Mine in [Bohemia](/source/Bohemia), [Czech Republic](/source/Czech_Republic).<ref name=Mindat/>

==Crystal structure==
CdIn<sub>2</sub>S<sub>4</sub> exhibits the [spinel](/source/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](/source/X-ray_diffraction) techniques because the two species are [isoelectronic](/source/isoelectronic), but both [Raman spectroscopy](/source/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 MIn<sub>2</sub>S<sub>4</sub> 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](/source/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 CdIn<sub>2</sub>S<sub>4</sub> 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

{{sulfide-mineral-stub}}

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Adapted from the Wikipedia article [Cadmoindite](https://en.wikipedia.org/wiki/Cadmoindite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cadmoindite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.