Ungemachite

{{Infobox mineral | name = Ungemachite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = Sulfate mineral | formula = K₃Na₈Fe(SO₄)₆(NO₃)₂•6H₂O | IMAsymbol = Ugm | molweight = | strunz = 7.DG.10 | dana = 32.2.3.1 | system = Trigonal | class = ''R''{{overbar|3}} | symmetry = | unit cell = a = 10.898 Å, c = 24.989 Å | colour = pale yellow | habit = | twinning = | cleavage = | fracture = uneven | tenacity = brittle | mohs = 2{{half}} | luster = vitreous | streak = | diaphaneity = | density = 2.287 | polish = | opticalprop = uniaxial (−) | refractive = nω = 1.502 nε = 1.449 | birefringence = 0.053 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>{{cite web |title=Ungemachite |url=https://www.mindat.org/min-4095.html}}</ref> }} '''Ungemachite''' is a rare mineral (K₃Na₈Fe(SO₄)₆(NO₃)₂ · 6H₂O) known from only two locations - a copper deposit in the Atacama Desert (Chile) and in the New Cobar copper–gold deposit, New South Wales (Australia). The formation of Ungemachite requires the presence of nitrate minerals, which requires arid conditions, as well as sulfates. It has been synthesized under laboratory conditions and its properties have been studied.<ref>{{Cite journal |last1=Vargas Jentzsch |first1=Paul |last2=Ciobotă |first2=Valerian |last3=Bolanz |first3=Ralph Michael |last4=Kampe |first4=Bernd |last5=Rösch |first5=Petra |last6=Majzlan |first6=Juraj |last7=Popp |first7=Jürgen |date=2012 |title=Raman and infrared spectroscopic study of synthetic ungemachite, K3Na8Fe(SO4)6(NO3)2·6H2O |url=https://linkinghub.elsevier.com/retrieve/pii/S0022286012004565 |journal=Journal of Molecular Structure |language=en |volume=1022 |pages=147–152 |doi=10.1016/j.molstruc.2012.05.024|url-access=subscription }}</ref> The mineral was described in 1936 and is named after the mineralogist Henri Ungemach.<ref>{{Cite journal |last=Warr |first=Laurence N. |date=2021 |title=IMA–CNMNC approved mineral symbols |url=https://www.cambridge.org/core/product/identifier/S0026461X21000438/type/journal_article |journal=Mineralogical Magazine |language=en |volume=85 |issue=3 |pages=291–320 |doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |issn=0026-461X|url-access=subscription }}</ref><ref>{{cite journal |last1=Groat |first1=Lee A. |last2=Hawthorne |first2=F. C. |year=1986 |title=Structure of ungemachite, K3Na8Fe3+) (SO4)6(NO3)2.6H2O, a mixed sulfate-nitrate mineral |journal=American Mineralogist |volume=71 |issue=5–6 |pages=826–829}}</ref><ref>{{cite journal|author1=Peacock, M. A.|author2= Bandy, M. C. |year=1936|title= Ungemachite and clino-ungemachite: new minerals from Chile.|journal= American Mineralogist|volume=21 |issue=12 |url= http://www.minsocam.org/ammin/AM21/AmMin_v21_n12_Pt_2.pdf|page=2}}</ref>

== References == {{reflist}}

== External links == * [https://www.webmineral.com/data/Ungemachite.shtml Ungemachite Mineral Data] * [https://www.mindat.org/min-4095.html Mineral information]

Category:Minerals described in 1936 Category:Sulfate minerals Category:Trigonal minerals