# Ichnusaite

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> Source: https://en.wikipedia.org/wiki/Ichnusaite
> Source revision: 1299954115
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{{Infobox mineral
| name        = Ichnusaite
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| category    = [Molybdate mineral](/source/Molybdate_mineral)s
| formula     = Th(MoO<sub>4</sub>)<sub>2</sub>•3H<sub>2</sub>O
| IMAsymbol   = Ich<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>
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| system      = Monoclinic
| class       = Prismatic (2/m) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''P2''<sub>1</sub>/''b'' 
| unit cell   = a = 9.68, b = 10.38<br/>c = 9.38&nbsp;[Å], β = 90.00° (approximated) <br/>Z&nbsp;=&nbsp;4
| color       = Colorless
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| twinning    = 
| cleavage    = {100}, perfect
| fracture    = 
| tenacity    = Brittle
| mohs        = 
| luster      = Pearly adamantine
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| other       = 25px [Radioactive](/source/Radioactive)
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| references  = <ref name=AM/><ref name=Mindat/><ref name=Mineralienatlas>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Ichnusaite Mineralienatlas]</ref>
}}
'''Ichnusaite''' (pronounced iknusa-ait) is a very rarely found [mineral](/source/mineral).<ref name=Mindat>{{cite web|url=http://www.mindat.org/min-45998.html |title=Ichnusaite- Mindat.org |website=Mindat.org |accessdate=2016-03-06}}</ref> Ichnusaite is a natural compound of [thorium](/source/thorium) and [molybdenum](/source/molybdenum) with the formula Th(MoO<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O. It was discovered in Su Seinargiu, [Sarroch](/source/Sarroch), [Cagliari](/source/Cagliari), [Sardegna](/source/Sardinia), Italy in 2013.<ref name=AM>{{Cite journal|title = Ichnusaite, Th(MoO4)2·3H2O, the first natural thorium molybdate: Occurrence, description, and crystal structure|url = http://ammin.geoscienceworld.org/content/99/10/2089|journal = American Mineralogist|date = 2014-10-01|issn = 0003-004X|pages = 2089–2094|volume = 99|issue = 10|doi = 10.2138/am-2014-4844|language = en|first1 = Paolo|last1 = Orlandi|first2 = Cristian|last2 = Biagioni|first3 = Luca|last3 = Bindi|first4 = Fabrizio|last4 = Nestola|s2cid = 97061833|access-date = 2016-02-13|archive-url = https://web.archive.org/web/20160521090233/http://ammin.geoscienceworld.org/content/99/10/2089|archive-date = 2016-05-21|url-status = dead|url-access = subscription}}</ref> The name is from the old Greek name of [Sardinia](/source/Sardinia), Ιχνουσσα, Ichnusa.<ref>{{Cite web|title=Ichnusaite|url=https://www.mindat.org/show.php?id=45998&ld=1|access-date=2021-05-07|website=www.mindat.org}}</ref><br /> This locality is also a place of discovery of the second  natural [thorium](/source/thorium) [molybdate](/source/molybdate) - [nuragheite](/source/nuragheite).<ref>{{cite web|url=http://www.mindat.org/min-46000.html |title=Nuragheite - Mindat.org |website=Mindat.org |accessdate=2016-03-06}}</ref>

==Occurrence and association==
Muscovite, [nuragheite](/source/nuragheite), and xenotime-(Y) are the associates of ichnusaite.<ref name=AM/>

==Notes on chemistry==
Ichnusaite is chemically pure.<ref name=AM/>

==Crystal structure==
The main features of the crystal structure of ichnusaite are:<ref name=AM/>
* electroneutral Th(MoO<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub> (100) sheets
* ThO<sub>7</sub>(H<sub>2</sub>O)<sub>2</sub> and MoO<sub>4</sub> polyhedra polymerize to give the above sheets
* sheets are stacked along [100] and held by hydrogen bonds
  
==Bibliography==
* Orlandi, P., Biagioni, C., Bindi, L. und Nestola, F. (2013) Ichnusaite, IMA 2013- 087. CNMNC Newsletter No. 18, December 2013, page 3255; Mineralogical Magazine, 77, 3249-325
* http://rruff.geo.arizona.edu/AMS/result.php?mineral=Ichnusaite
* https://web.archive.org/web/20160521090233/http://ammin.geoscienceworld.org/content/99/10/2089
* https://arpi.unipi.it/handle/11568/638691#.Vr93OUKuAt4 
* http://www.degruyter.com/dg/viewarticle/j$002fammin.2014.99.issue-10$002fam-2014-4844$002fam-2014-4844.xml
* https://www.bbc.com/news/science-environment-35569659

==References==
{{reflist}}

Category:Molybdate minerals
Category:Thorium minerals
Category:Monoclinic minerals
Category:Trihydrate minerals
Category:Minerals in space group 14
Category:Minerals described in 2014

{{mineral-stub}}

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