Nuragheite

{{Infobox mineral | name = Nuragheite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Molybdate minerals | formula = Th(MoO4)2·H2O | IMAsymbol = Nur<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 = | strunz = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = ''P''21/c | unit cell = a = 7.36, b = 10.54 c = 9.49 [Å], β=91.88° (approximated) | color = Colorless | colour = | habit = Thin tablets | twinning = | cleavage = {100}, perfect | fracture = | tenacity = Brittle | mohs = | luster = Pearly adamantine | streak = White | diaphaneity = | gravity = 5.15 (calc., approximated) | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = 25px Radioactive | prop1 = | prop1text = | references = <ref name=AM/><ref name=Mindat/> }} '''Nuragheite''' is a rare<ref name=Mindat>{{cite web|url=http://www.mindat.org/min-46000.html |title=Nuragheite - Mindat.org |website=Mindat.org |accessdate=2016-03-12}}</ref> natural thorium molybdate, formula Th(MoO4)2·H2O, discovered in Su Seinargiu, Sarroch, Cagliari, Sardegna, Italy.<ref name=AM>Orlandi, P., Biagioni, C., Bindi, L., and Merlino, S., 2015. Nuragheite, Th(MoO4)2·H2O, the second natural thorium molybdate and its relationships to ichnusaite and synthetic Th(MoO4)2. American Mineralogist 100(1), 267-273</ref> This locality is also a place of discovery of the other thorium molybdate - ichnusaite, which is a trihydrate.<ref>{{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 = 2016-03-12|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>

==Occurrence and association== Nuragheite is a part of molybdenum-bismuth mineralization. It coexists with ichnusaite, muscovite, and xenotime-(Y).<ref name=AM/>

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

==Crystal structure== The crystal structure of nuragheite is composed of (100) layers with IXTh-centered polyhedra and Mo-centered tetrahedra.<ref name=AM/> It is thus similar to that of ichnusaite.

==References== {{reflist}}

Category:Thorium minerals Category:Molybdate minerals Category:Monohydrate minerals Category:Monoclinic minerals Category:Minerals in space group 14 Category:Minerals described in 2015