{{Short description|Rare silver mineral}} {{Infobox mineral | name = Eugenite | alt = Eugenite with Luanheite | category = silver mineral | boxwidth = | boxbgcolor = | image = Eugenite_with_Luanheite_-_Privolnoye_-_Sakha_Republic_-_Russia.jpg | caption = Eugenite with Luanheite | strunz = 1.AD.15c | formula = Ag<sub>11</sub>(Hg<sub>2</sub>)<sub>2</sub> | IMAsymbol = | molweight = | system = Orthorhombic | class = Dipyramidal (mmm) <br/>H-M symbol: (2/m 2/m 2/m) | symmetry = ''Pbam'' (no. 55) | unit cell = a = 6.092&nbsp;Å, b = 14.407&nbsp;Å <br/>c = 7.811&nbsp;Å; Z&nbsp;=&nbsp;4 <br/>V = 685.55 <br/>a:b:c = 0.423&nbsp;:&nbsp;1&nbsp;:&nbsp;0.542 | color = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = | refractive = | opticalprop = | birefringence = | pleochroism = | streak = | gravity = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = | references = <ref name="Webmin">{{Cite web|url=https://webmineral.com/data/Eugenite.shtml|title=Eugenite Mineral Data|website=webmineral.com}}</ref><ref name="Mindat">{{Cite web|url=https://www.mindat.org/min-1422.html|title=Eugenite|website=www.mindat.org}}</ref> }}

'''Eugenite''' is a rare silver-mercury mineral. It crystallizes in the orthorhombic crystal system.

== History ==

Its occurrence was first confirmed in the Sieroszowice copper mine, Lubin-Sieroszowice district, Poland.<ref name="Webmin"/>

== Etymology ==

The mineral is named in honor of Eugen Friedrich Stumpfl (27 November 1931, Munich, Germany - 12 July 2004, Innsbruck, Austria), professor of mineralogy, Mining Institute, Leoben (Austria), for his studies of noble metal compounds.<ref name="Mindat"/>

== Physical properties ==

It has a silver white color. And it is metallic and isometric.<ref>{{Cite web|url=https://www.dakotamatrix.com/mineralpedia/6026/eugenite|title=Eugenite mineral information and data|first=Dakota Matrix|last=Minerals|website=www.dakotamatrix.com}}</ref>

== Occurrence ==

It is mostly found in cuprite and in low-grade copper sulfide ores in shale and carbonate rocks.<ref name="Webmin"/>

==References== {{reflist}}

== External links ==

* [https://www.mindat.org/min-1422.html Eugenite] * [https://webmineral.com/data/Eugenite.shtml Eugenite Mineral Data] * [https://www.dakotamatrix.com/mineralpedia/6026/eugenite Eugenite mineral information and data] * [https://commons.wikimedia.org/wiki/Category:Eugenite Category:Eugenite - Wikimedia Commons]

Category:Silver minerals Category:Minerals in space group 55 Category:Minerals described in 1986