{{Short description|Sulfate mineral}} {{infobox mineral | name = Rozenite | category = Sulfate mineral | boxwidth = | boxbgcolor = | image = Rozenit, Maroko.jpg | imagesize = | alt = | caption = Rozenite from Morocco | formula = Fe<sup>2+</sup>SO<sub>4</sub>·4(H<sub>2</sub>O) | IMAsymbol = Rzn<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |url-access=subscription}}</ref> | molweight = | strunz = 7.CB.15 | dana = 29.06.06.01 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P''2<sub>1</sub>/n | color = Colorless, white, pale green | colour = | habit = As concretions and nodules; most commonly as powdery efflorescences or coatings on melanterite | twinning = | cleavage = | fracture = | tenacity = | mohs = 2–3 | luster = Vitreous to dull | streak = White | diaphaneity = Semitransparent | gravity = 2.29 | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.526 – 1.528 nβ = 1.536 – 1.537 nγ = 1.541 – 1.545 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = Water soluble | other = | alteration = |references = <ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/rozenite.pdf Rozenite in the Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-3469.html Rozenite data on Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Rozenite.shtml Webmineral data for rozenite]</ref> }} '''Rozenite''' is a hydrous iron sulfate mineral, Fe<sup>2+</sup>SO<sub>4</sub>·4(H<sub>2</sub>O).
It occurs as a secondary mineral, formed under low humidity at less than {{convert|21|C}} as an alteration of copper-free melanterite, which is a post mine alteration product of pyrite or marcasite. It also occurs in lacustrine sediments and coal seams. Associated minerals include melanterite, epsomite, jarosite, gypsum, sulfur, pyrite, marcasite and limonite.<ref name=Handbook/>
It was first described in 1960 for an occurrence on Ornak Mountain, Western Tatra Mountains, Małopolskie, Poland. It was named for Polish mineralogist Zygmunt Rozen (1874–1936).<ref name=Handbook/><ref name=Mindat/>
The thermal expansion of rozenite was studied from {{convert|-254|C}} to {{convert|17|C}} using neutron diffraction. Rozenite exhibits negative linear thermal expansion, meaning that it expands in one direction upon cooling.<ref>{{Cite web |last= |title=Scientific article rozenite |url=http://www.minsocam.org/msa/ammin/AM_Preprints/8502ForbesPreprint.pdf}}</ref>
==References== {{Reflist}}
Category:Sulfate minerals Category:Iron(II) minerals Category:Monoclinic minerals Category:Minerals in space group 14
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