Eugenite tangly with Luanheite - Privolnoye, Sakha Republic , Russia — Photo: Ra'ike (see also: de:Benutzer:Ra'ike ) · CC BY-SA 3.0
Eugenite
A rare orthorhombic silver-mercury alloy mineral.
Intro adapted from Wikipedia (CC BY-SA).
Eugenite is an IMA-recognized mineral species in the native element class, with the chemical formula Ag₁₁Hg₂.
It crystallizes in the cubic crystal system (space group Fm-3m).
Key properties: specific gravity 10.75; Metallic luster.
IMA symbol Eug, IMA status: approved, named in 1981.
Found in low-grade copper sulfide ore in black shale and carbonate rocks (Lubin mine, Poland); in cuprite (Bisbee, Arizona, USA).
It is found associated with Chalcocite, covellite, tennantite, hematite, calcite, ankerite, gypsum (Lubin mine, Poland).
The mineral was named to honor Professor Eugen Friedrich Stumpfl (1935–), Austrian mineralogist, Mining University, Leoben, Austria, for his studies of noble metal compounds.