EugeniteEugenite is a rare silver-mercury mineral. It crystallizes in the orthorhombic crystal system.HistoryIts occurrence was first confirmed in the Sieroszowice copper mine, Lubin-Sieroszowice district, Poland.EtymologyThe mineral is named in honor of Eugen Friedrich Stumpfl, professor of mineralogy, Mining Institute, Leoben, for his studies of noble metal compounds.Physical propertiesIt has a silver white color. And it is metallic and isometric.OccurrenceIt is mostly found in cuprite and in low-grade copper sulfide ores in shale and carbonate rocks.