{{Short description|Rare sulfate mineral}} {{Infobox mineral | name = Hermannjahnite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Sulfate | formula = CuZn(SO<sub>4</sub>)<sub>2</sub> | IMAsymbol = Hjh<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) <br/><small>(same H-M symbol)</small> | symmetry = ''P2''<sub>1</sub>/n | unit cell = a = 4.81, b = 8.48, <br/>c = 6.76&nbsp;[Å], β = 93.04° (approximated) | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref name=N/> }} '''Hermannjahnite''' is a rare sulfate mineral with the relatively simple formula CuZn(SO<sub>4</sub>)<sub>2</sub>. It is one of many fumarolic minerals discovered on the Tolbachik volcano.<ref name=N>Siidra, O.I., Nazarchuk, E.V., Agakhanov, A.A., Lukina, E.A., Vergasova, L.P., Filatov, S.K., Pekov, I.V., Karpov, G.A., and Yapaskurt, V.O., 2015. Hermannjahnite, IMA2015-050. CNMNC Newsletter No. 27, October 2015, 1225; Mineralogical Magazine79, 1229–1236</ref><ref>{{cite web|url=http://www.mindat.org/loc-5602.html |title=Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia - Mindat.org |website=Mindat.org |accessdate=2016-03-13}}</ref>

==Relation to other minerals== Hermannjahnite is a zinc-analogue of dravertite – another mineral from prolific Tolbachik.<ref>{{cite web|url=http://www.mindat.org/min-46608.html |title=Dravertite: Dravertite mineral information and data |website=Mindat.org |accessdate=2016-03-13}}</ref> Minerals somewhat chemically similar to hermannjahnite include ktenasite and christelite.<ref>{{cite web|url=http://www.mindat.org/min-2282.html |title=Ktenasite: Ktenasite mineral information and data |website=Mindat.org |accessdate=2016-03-13}}</ref><ref>{{cite web|url=http://www.mindat.org/min-6870.html |title=Christelite: Christelite mineral information and data |website=Mindat.org |accessdate=2016-03-13}}</ref>

==References== {{reflist}}

==External links== * Hermannjahnite on Mindat: {{cite web|url=http://www.mindat.org/min-46806.html |title=Hermannjahnite: Hermannjahnite mineral information and data |website=Mindat.org |accessdate=2016-03-13}}

Category:Sulfate minerals Category:Copper(II) minerals Category:Zinc minerals Category:Monoclinic minerals Category:Minerals in space group 14 Category:Minerals described in 2017

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